Originally Posted by houkouonchi

I once put 500 miles on a single tank of gas in my 370z. One thing I have noticed is the Z gets near its EPA suggested MPG going around 80 MPH for highway ammount. If I really only go the speed limit 65-70 that goes from around 26-27 MG to 30-31 MPG.

Too bad the same is not for my GT-R. If I go 80 or a bit more I get like 20-21 MPG if I am lucky and I have to go 70 or below to actually get the EPA 24 MPG.

Not that I really care about the MPG that much but I am curious how the numbers differe so much in real practice for the cars considering the highway difference is only 2 mpg (24 vs 26)