What year and model are you talking about?

It really depends on other features of the engine and tranny
and driving needs.

www.fueleconomy.gov is a great resource for comparing fuel
efficiency of different years and models, especially since
individuals may now report their personal experiences with
fuel efficiency.

"Chris" > wrote
> Is a 5AT more fuel efficient than a 4AT, if we consider
> the same car?
> If yes, in which road condition?
> The number of RPM on a 5AT is different (lower) than a 4AT
> for the same speed?
>
> Thanks,
> Chris
>