I've had a tank avg 32mpg in my 2010 Prius
we were running 75-80mph the whole time, very windy out
and we had a Thule cargo box on top the whole time
as well as very loaded for the road trip
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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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