Your tractor or harvester is using too much fuel.
Then an ECO tuning is the option for you.

The increase in torque and power, in conjunction with the adjustment of the fueling maps, enables you to save a lot of money in the long run.

For example:

You or your customer are plowing a field with a big plow attached to a small tractor.
At full throttle with stock power, it plows at a maximum speed of 15 km/h (9 mp/h).
With the ECO Tune applied to the Tractor could now plow at for example 18 km/h (11 mp/h),

but if you keep on plowing at 15 km/h (9 mp/h), the tractor will use less fuel.

This example works because with the stock power you are plowing at 100% engine load

to get to 15 km/h (9 mp/h).
With the ECO tuning, you are running the tractor at a lower engine load to achieve the same plowing speed.

The result of that is that when you are plowing at the same speed as stock you are demanding less from the engine

and in turn, it will use less fuel.