there a company that sells this device , taht plugs into OBD2 DLC conn. and will show Real time MPG and many things on a little panel.
but not on these old dogs.
for accuracy you just need to know the fuel pressure on your car.
(and the flow rates on your injector)
in the old days we just had a vacuum gage.
64 GTO had it built in and had a green section for economy.
car could suck gas at 8mpg if you had heavy foot.
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