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Old school mpg meter Popular mechanics writeup
Appears to combine fuel flow rate and engine vacuum, might be useful data for carbed engine folks. Probably not able to find one, but useful info for someone to build their own. Only current carb option I know is a marine application gps with fuel flow meater attachment for 599 total.
Popular Mechanics - Google Books
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2007 Silverado 3500 classic duramax diesel, Allison 6 speed auto, extracab long bed. Doing head gaskets, will probably do econo tune and aero mods next.
Mad max would have driven a metro
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