Hogwash is the correct response. Bring back the manual transmisson with 6th gear an overdrive gear. In my 1995 Z28 Camaro, I only turn 2,000 rpms at 65 mph. Oh yeah it runs on mid range octane and goes like stink if I'm feeling frisky.
From your lips to God's ears. I have a 2001 Corvette that gets 32 mpg @60 mph in 6th gear. It also does 0-60 in 4.7 seconds when I'm feeling frisky.