we now have a BMW 320D in today for a custom stage one remap Going from 163BHP and 380NM Going to 215BHP and 440NM Saving up to 10mpg extra but can’t guarantee the exact amount you will gain as every car is different. This will show more in the summer, warmer months, as using heater, heated windows, heated seats can use more mpg. * Performance gains are commensurate with age, mileage, and condition of the vehicle, along with environmental conditions and grade of fuel. we run a full health check