On Wed, 05 Nov 2008 07:01:25 -0500, 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?
>

depends how well the ratios are matched to the power/torque curves of the
engine. small differences in rpm's don't mean too much when it comes to
cruising economy - you can have lower rpm's but higher gas consumption if
the curves aren't a good match.