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Old 02-20-2013, 11:18 PM   #14 (permalink)
EcoModding Lurker
Join Date: Jan 2013
Location: Oregon, US
Posts: 43

ZoomFreakingZoom - '88 Mazda RX7 Convertible
90 day: 19.02 mpg (US)

Geo - '96 Geo Prizm Base
90 day: 32.42 mpg (US)
Thanks: 2
Thanked 2 Times in 2 Posts
Originally Posted by arcosine View Post
MPG should be inversely proportional to MPH.
No. Sure there is twice as much wind resistance at 30 mph than there is at 60mph - it's a square law. But MPG isn't based solely on wind resistance, another important consideration is how efficient the engine is working. I got my best tank going 75-85 on california freeways.

Inversely proportion isn't quite the right mathematical wording to describe the relationship because, again, it's a square law.
1988 rx7 convertible. Streetported, racing beat header and presilencer replacing all 3 catalytic converters. Atkins 6 port sleeves. K&N cone filter intake. 22mpg average, 27mpg max. Spreadsheet (updated regularly):
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