1. Tire pressure & ballasting: the underrated classic
Hardly any factor is given away in the field as often as tire pressure. In the field, the rule is: pressure as low as possible for a large contact patch and little slip; on the road, the opposite. Driving onto the field with road pressure quickly costs 5–10 % in fuel through slip and soil compaction – which is why a central tire inflation system often pays for itself within a few years at high utilization. The same applies to ballasting: unnecessary weights cost fuel on every trip, while too little ballast increases slip in heavy draft work.
2. Engine speed & driving style: "throttle back, gear up"
Modern tractor engines usually reach their consumption optimum well below rated speed. For work that does not require full PTO speed, the old rule "throttle back, choose a higher gear" applies: depending on the job, this cuts consumption by 5–15 % without hurting field capacity. Continuously variable transmissions with engine-transmission management take this decision off the driver's hands – older machines demand it of them. Idle time adds up too: a tractor at idle burns several liters per hour without doing a single stroke of work.
3. Working methods & tillage
Tillage is the most diesel-intensive operation in arable farming. Anyone who can switch from the plow to mulch or no-till seeding saves 20–50 % of the fuel for crop establishment, depending on method and location – though this is an agronomic system decision, not a mere fuel-saving measure. Smaller levers with immediate effect: optimize working widths and field logistics, avoid overlaps with GPS guidance (typically 3–5 % less double-covered area) and bundle transport runs.
4. Maintenance & machine condition
Blunt shares, clogged air filters or badly adjusted implements increase draft requirement and thus consumption by up to 10 % without anyone noticing in daily work. Especially before labor-intensive campaigns (planting, harvest), checking wear parts, filters and settings pays off twice: less diesel and fewer unplanned breakdowns in the middle of the campaign.
5. Fuel optimization with a retrofit system
Complementing driving style and setup, there are technical retrofit solutions that act on combustion itself. The Fuel Eco Tech (FET) system is integrated into the fuel line – after the filter, before injection – and improves mixture preparation without interfering with the engine management. For farm machinery this is relevant because the effect applies to every operating hour, regardless of driver, weather and operation.
A concrete real-world figure: in a documented field test on a Unimog, a reduction of around 10.9 % per operating hour was measured in winter operation against the reference period. In the standardized laboratory test (diesel), the savings averaged up to 6 % (WLTC cycle) and up to 15 % in constant-speed runs. Test reports and further practical examples – including farm machinery – can be found under News & laboratory test and References.
Context: the actual saving depends on the load profile. Steady, long operations (transport, mowing, tillage) benefit more than short jobs with frequent load changes. The figures for tire pressure, engine speed and methods are typical industry values from farm machinery advisory work.
Conclusion: adjust first, then retrofit – and measure both
The order makes the difference: tire pressure, ballasting and engine speed cost nothing and should be exhausted first. After that, it is worth looking at technical measures such as fuel optimization, whose effect applies to every operating hour regardless of the driver. And: no measurement, no statement – anyone who documents consumption per hectare or per operating hour sees in black and white which measure pays off on their own farm.