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not always the case
my GTO gets solidly better fuel economy @70-75mph than at 60
as did my Camaro
but both cars were torque monster V8's with Double OverDrive 6 speeds and tall final gear ratios
when my GTO was stock
I routinely got 31-32mpg (with an avg speed of 70mph over a 400 mile drive)
but in order to get that, I had to keep the speed up the whole drive (coming down to 55 and back up, or taking exits, and getting back up to highway speed brought it down quick)
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2005 GTO 6.0 V8 (600hp)
1991 Geo Metro 1.0 3/5 base
2010 Prius II (replaced 2001 Tahoe 5.3 V8 April 2014)
1994 F-350 7.3 TurboDiesel (Rollin' Coal)
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