If a horse(the Engine) pulls a ton(Car) and is 50 km return 4 hours after the sar? very tired and avr? need to eat(Diesel), if we put the other three horses instead to help percoreranno the same path and the weight will be? divided by 4 (25kgx4). With less effort ? path to the same section in less time and without eating they will be ready to start again, to redo, re the same stage. A good mapping if it is gritty it should give the same fuel consumption that was the car before you mod it, and if you bring gently why? once ? been mod. not c'? need accellerarla as before why? this ? the point:eat less with more? pair.