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Milwaukee · 02-02-2010, 02:48 AM

My 79 F150 with 4.9L 4 speed.
31X10.50X15
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.

02-02-2010, 02:48 AM	#11 (permalink)
Milwaukee EcoModding Apprentice Join Date: May 2009 Location: Michigan Posts: 111 Thanks: 8 Thanked 5 Times in 5 Posts	My 79 F150 with 4.9L 4 speed. 31X10.50X15 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.