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Re: Calculating Mpg.
My 75 is similar. 350/TH350, 3.42 rear gear and 28" tires. Eddy 1405 carb, performer intake, headers, otherwise stock. An rpm calculator puts engine rpm for both mine and yours at about 2700 @ 65mph. Mine gets about 12 mpg @70~75 and 14 @ 60~65. Nowhere around here to safely drive at 55 for long distances.
I burn the cheapest gas I can find, usually E10 but sometimes 100% gas if I am filling portable cans for mowers at the time.
Might be time to check timing and tune the EFI.
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