Originally Posted by gpshumway
I hear you, but remember the EPA cycle specifies shift points. Points which are likely sub-optimal for a large V8. I suspect a good driver can beat that EPA number handily.
The shift cycle can be negotiated. The thing you have to realize is that there are 5 tests used to calculate fuel economy ("5 cycle fuel economy") and complicated weighting involved that's constantly changing.
A lot of it comes down to back room negotiations among a few people.