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Old 02-02-2010, 02:48 AM   #11 (permalink)
EcoModding Apprentice
Join Date: May 2009
Location: Michigan
Posts: 111
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My 79 F150 with 4.9L 4 speed.
3.55 in gear ratio

I get 21 mpg in summer at 60 mph.

That were stock but have 4" lift kit.

Most important you need vacuum gauge and keep 15 psi or higher will help you improve mpg double.

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