Fuel consumption on CLAAS combines: What it depends on and 10 ways to cut liters per decare

Fuel consumption on CLAAS combines: What it depends on and 10 ways to cut liters per decare

17.11.2025

Why fuel consumption is a critical metric for every CLAAS combine

Fuel consumption has long since stopped being just a number at the end of the harvest campaign. With today’s diesel prices, land rents and pressure on margins, every extra liter goes straight into your cost per decare. Even a 1-liter difference per decare between two combines working on 10–15,000 decares means tens of thousands of leva per year. That is money that could go into new equipment, repairs or better conditions for your people – or it can simply disappear through the exhaust.

With CLAAS combines, fuel consumption should always be viewed together with machine capacity and grain losses. A machine that “uses less” per hour on paper but harvests more slowly, spends more time in the field and leaves more grain on the ground often ends up more expensive per decare. Conversely, a more powerful combine with a wider header may show higher liters per hour but deliver fewer liters per decare and finish the campaign faster and more safely.

Fuel consumption is also an indicator of the overall health of the machine and the organization in the farm. High and unstable consumption often means a mix of poor settings, missed preventative maintenance, inefficient trailer logistics, an inexperienced operator or a machine that is simply not suitable for the actual field size and yields. That is why farmers who think long-term are increasingly interested not in “liters per hour” but in the real picture – how much does the harvest per decare actually cost with a specific CLAAS combine.

Main factors that determine fuel consumption on CLAAS combines

Model, power, working width and tire pressure

The first factor is obvious – the model and engine power of the combine. Series such as CLAAS AVERO, TUCANO and LEXION have different concepts, different engines and different maximum capacity. Smaller machines often look “economical” in liters per hour, but when you compare the actual harvested area and yield, the picture changes. A more powerful combine combined with a wider header can process the same area in significantly less time and with lower fuel consumption per decare.

The working width of the header is directly related to loading the machine. Moving from 5.4 m to 6.8 m or 7.5+ m is not just a “luxury”, it is a tool for higher productivity. With good field organization, a wider header allows a lower driving speed at the same capacity, fewer maneuvers and more even machine operation. That stabilizes consumption and reduces peak loads.

A very important but often underestimated element is tire pressure. Incorrect pressure increases slippage, rolling resistance and engine load. On heavy soils or under wet conditions, the difference between optimal and wrong pressure is clearly visible both in fuel consumption and in forward speed. Correct tire settings (or using tires and axles adapted to the conditions) are a cheap way to save real liters of fuel.

Machine settings and losses during operation

The second major block is related to machine settings. Engine rpm, forward speed, concave clearance, drum speed, fan and sieves – all of this determines not only threshing quality but also how hard the engine has to work. A combine that constantly “struggles” uses excessive fuel and works near its limits.

Wrong settings lead to two expensive consequences: more grain losses and more time in the field. Blockages, the need to go over the same area again, increased load on straw walkers and the sieve box – all of that means extra hours and extra liters from the fuel tank. That is why it makes sense in the article (and on the site) to have a clear internal link to a separate topic on grain losses with CLAAS combines – explaining how incorrect settings increase losses and extend field time, which in turn raises fuel consumption per decare.

Crop type and yield level

Fuel consumption must always be viewed through the lens of crop type and yield. Harvesting standard wheat at 400–500 kg/da and harvesting heavy oilseed rape or high-yield sunflower are completely different jobs for the machine. In rape and sunflower the crop is heavier, moisture is often higher and the header works at a different geometry. Expectedly, fuel consumption per hour and per decare goes up.

The higher the yield, the more material passes through the machine. That is good news for the farmer, but it sets the task of sizing the combine correctly. With CLAAS combines the advantage is that there is a clear step-up between classes and capacities, so the farm can choose a machine that “breathes easily” at the typical yields in the region instead of constantly working at the limit.

The operator and driving style

The same CLAAS combine can show completely different fuel consumption in the hands of two different operators. One will work in a controlled way, with smooth maneuvers, optimal rpm and careful monitoring of on-board parameters. The other will “floor it”, brake often, make empty runs and miss opportunities to optimize the route.

Habits such as long idling, unnecessarily high rpm when there is no load, reacting too late to blockages or changing conditions – all of this pushes liters per decare up with no benefit. That is why at handover of a new CLAAS combine it is important to have real operator training, not just a quick run-through of the main functions. When people understand why the machine reacts in a certain way, they start working more economically and consistently.

Systems such as CEBIS and TELEMATICS not only record data but also act as a “coach” – they show the operator his driving style, where the machine was overloaded, where it spent too long idling and where speed could safely be increased. That way training does not end on day one; it continues throughout the whole season, based on real data.

The field, logistics and running gear

Even the perfect combine cannot compensate for poor field organization. Unplanned routes, awkward field shapes, no clear system for trailers – all of this leads to empty runs and unnecessary engine and header operating time without actual work. Proper trailer positioning, logical field tracks and synchronization between combine and transport can noticeably reduce fuel consumption.

The condition of the running gear is also crucial. Worn bearings, loose chains, faulty or overly hard tires all create additional resistance and load. The engine burns more fuel just to overcome mechanical losses that could easily be eliminated with timely service. These are liters that can be saved if the farm follows a preventive maintenance plan instead of running machines “until they break”.

How to calculate the real fuel consumption per decare with a CLAAS combine

Liters per hour versus liters per decare – which matters more

Many farmers instinctively ask “how much does it use per hour” when they look at a CLAAS combine. That figure is useful, but it is only part of the picture. The real indicator of efficiency is consumption per decare and per ton of grain harvested. A combine that uses 30 liters per hour but harvests 20–25 decares in that hour can be much more profitable than a machine that uses 20 liters per hour but covers only 10–12 decares.

Modern CLAAS on-board computers – for example CEBIS – give the operator instant and average fuel consumption, as well as information on engine load and capacity. It is important that this data is not ignored. If the combine constantly runs at high rpm with low load, it signals that speed can be increased or settings adjusted. If consumption spikes in certain conditions, that suggests a need to rethink the route, cutting height or even request a service check.

Practical formula for the farm

To calculate the real fuel consumption per decare, you need three things:

• How many liters of fuel were used on a given field or day.
• How many decares were actually harvested.
• Optionally – the average yield, so you can also calculate consumption per ton.

The formula is simple:
consumption per decare = liters used / harvested decares.

For example, if a CLAAS TUCANO uses 600 liters in a day and harvests 2,200 decares, the consumption is about 0.27–0.28 l/da. In another situation – heavier oilseed rape, wetter conditions and more complex logistics – the same combine might reach 0.4–0.5 l/da. That does not automatically mean the machine is “bad”; it means conditions are different. The important thing is to compare similar days and crops, not isolated numbers without context.

How to compare different machines and seasons

When a farm runs more than one CLAAS combine or is considering replacing an older model with a newer one, it is useful to look at trends rather than single campaigns. Record fuel consumption per decare by crop, average yields and the total time needed to finish harvesting. If for three consecutive years consumption and time increase with a given model while area stays roughly the same, it signals that the machine is reaching its limits or is already working with compromises.

When comparing two models – for example an older TUCANO and a newer LEXION – you should look at:

• fuel consumption per decare;
• grain losses;
• number of days needed to finish the campaign;
• maintenance and repair costs.

Only when you put these factors together do you see the real economics of the machine. Here the opinion of the service team is very valuable – they can see when breakdown frequency becomes too high and maintenance costs are “eating up” any savings from postponing a new investment.

10 practical ways to reduce fuel consumption on a CLAAS combine

Adjusting the combine by crop and working at optimal rpm

The first three ways are linked to machine settings.

1) Set the combine for the specific crop instead of running “one setting for everything”. Wheat, barley, oilseed rape and sunflower behave differently in the machine. CLAAS provides recommended starting ranges for drum speed, concave clearance, fan and sieves – start there and fine-tune according to actual crop flow.

2) Aim for optimal, not maximum rpm. An engine that constantly runs at the top of the rpm range with no real need simply burns extra fuel.

3) Keep a stable working speed. Constant “speed up – slow down” not only affects comfort, it also puts unnecessary stress on the engine and drivetrain.

Timely maintenance, filters and software updates (HOS)

4) Monitor the condition of filters, radiators and belts. A clogged air filter, dirty radiator or loose belts make the engine’s job harder and increase fuel consumption. A preventative filter change costs less than the fuel wasted over a whole campaign.

5) Use software updates offered by the manufacturer. On modern CLAAS machines, updates can improve engine management, optimize functions like tire pressure management and provide more precise power delivery. These are not “cosmetic” tweaks – they are a real opportunity to bring liters per decare down while keeping or even increasing productivity.

Smart logistics planning and field routes (minimizing idle time)

6) Plan field routes so that you minimize empty runs and headland turns. It is better to think from the beginning about where trailers will enter, where they will wait and where they will be loaded instead of improvising on the fly.

7) Keep trailers close to the actual harvesting flow. Queues of tractors waiting 15–20 minutes mean either poor coordination or not enough transport. In both cases the combine either sits idling or is forced to stop more often – both scenarios raise fuel consumption.

Investing in operator training and introducing a reporting system

8) Invest in training your operators. A well-trained combine driver can cut fuel consumption by 10–15% just by making better real-time decisions – when to slow down, when to change cutting height, when to wait for a trailer instead of doing an extra run.

9) Implement a simple reporting system – which operator, under what conditions and crops, achieved what consumption. Not for “finger-pointing”, but to see which practices work best and share them with the whole team.

Monitoring load and consumption with CLAAS TELEMATICS

10) Make active use of systems such as CLAAS TELEMATICS. They are not just “catalog extras” but tools for real cost control. Through telematics you can track:

• instant and average fuel consumption;
• engine load;
• working speed and throughput;
• idle time and work cycles.

The key is not just to look at the numbers but to use the reports for adjustments on the following days of the campaign. If you see that consumption in certain fields is consistently higher, you can change the route, reset the machine or give guidance to the operator on how to react. The same data is extremely useful for winter analysis – which practices worked, which did not, and what can be improved for the next season.

When a “bigger” CLAAS combine is actually more economical than a smaller one

A bigger combine always looks more intimidating as an investment – higher price, more power, wider header. But once you factor in real consumption per decare, grain losses and total campaign time, it often turns out that the larger machine is the truly economical option.

When you compare a smaller CLAAS with a narrow header to a larger model with a wide platform, the smaller machine tends to run almost non-stop near its limit, with higher relative fuel use and higher risk of overheating, blockages and losses. The larger combine works more calmly, with more power reserve, finishes the field faster and leaves less grain on the ground.

The decisive factor is the harvest window. If a farm regularly “drags” the campaign to the end of the period, incoming moisture, lodging and field losses can cost much more than the difference in fuel and lease payments. In such a situation the bigger CLAAS combine, although formally “thirstier” per hour, is cheaper per decare and more reliable for the yield.

Real results: How Agritec turns high fuel consumption into profit (case studies)

Case 1 – medium-sized farm moving from TUCANO 320 to TUCANO 440

A medium-sized grain farm with around 9–10,000 decares of cereals has been working for years with a CLAAS TUCANO 320. The machine does the job, but harvest campaigns become increasingly tense – yields go up, the harvest window shrinks and fuel consumption starts to climb. In the last two years the farm records around 0.45–0.5 l/da on wheat, with frequent re-harvesting and working late into the night.

After consulting the Agritec team, the farm decides to move to a CLAAS TUCANO 440 with a wider header and higher capacity. In the very first campaign the machine cuts several days off harvest time, allowing lower average ground speed and more stable settings. Fuel consumption per hour increases, but liters per decare drop to around 0.35–0.38 l/da at similar yields.

When the farm factors in lower losses, fewer emergency repairs and a calmer campaign, the difference in overall economics justifies the investment. TELEMATICS and on-board computer data clearly show the picture – more decares per day at lower fuel consumption per decare.

Case 2 – optimization through service and operator training only

Another example – a smaller farm working with a single CLAAS TUCANO but seeing high and unstable fuel consumption, especially in oilseed rape and sunflower. The machine is not old, but maintenance is done “piecemeal”, and there is only one operator, used to driving by feel.

The Agritec team performs a full pre-campaign check: radiators are cleaned, filters are replaced, belts and bearings are inspected, tire pressure is corrected. In parallel, the operator goes through a short but focused training – how to use CEBIS, how to track instant fuel consumption, how to react to changing conditions and how to plan the field route.

Already in the first season fuel consumption drops by about 10–12% without changing the machine itself. Harvesting runs more evenly and the combine works with fewer blockages and interruptions. This is a typical example of how the right service and attention to the human factor can deliver real fuel savings without the farm entering into a new large lease.

How Agritec can help you lower fuel consumption with your CLAAS combine

Bringing liters per decare down is not a one-off trick but a complete process – choosing the right machine, configuring it correctly, maintaining it on time and working with the people in the cab. This is where Agritec comes in.

The team can support you as early as the planning stage – selecting a CLAAS combine and header that match your real area, yields and harvest windows in your region. During operation, service programs and preventative maintenance reduce the risk of breakdowns at peak moments and keep fuel consumption under control thanks to well-prepared running gear, clean filters and up-to-date software.

And last but not least comes training. When operators know how to use systems such as CEBIS and CLAAS TELEMATICS, fuel consumption stops being a matter of “luck” and becomes a controllable metric. That way every season delivers not only a harvested crop but also clear statistics – how much your harvest with a CLAAS combine really costs per decare and where it can be made even more efficient. So if you want to permanently reduce liters per decare and optimize costs, get in touch with Agritec today for a consultation on machine selection, service or operator training.

Frequently asked questions about fuel consumption on CLAAS combines