With RaceChip Chiptuning, the available torque in the relevant RPM range – primarily the middle RPM range in which cars are normally driven – is increased, which allows for earlier gear changes and overall less shifting, which lowers your car's fuel consumption.

economy remapping, in particular, can improve fuel economy by up to 15%. This is because the engine is able to run at a more efficient operating point, which leads to less fuel consumption. The power band is also expanded, which means that the engine produces more power at lower revs.

Economy Remap | Economy Tuning - Quantum Tuning Designed to return an improved economy in turbo diesel engines. By re-characterising the torque limits on the engine, at lower rpm's you will benefit from additional performance and improved economy.

Remaps are also used to help MPG, but changing the torque curve. Emissions are affected by this.