[Hailcanadien]

I have an automatic transmission car with a sport shifter. The kind for people who don't know how to use a clutch. Anyway, I like to downshift, you know, rev the engine a bit or sometimes just to slow down, but my question is, when I do this, does it ruin gas mileage? I don't press down on the gas when I do this because I am usually coasting at the time. Is it still injecting fuel into the cylinders?

[cdad]

Can it ruin gas milage. Yes. Is it because its injecting fuel to do the work? No. It because when you slow down by compression rather then easing to a stop you have a greater chance of making corrections and that is where you lose the milage in your car.

[Hailcanadien]

Thanks