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It looks as though you are using the fuel gauge, not a refill of the tank, to determine the fuel consumed over a distance traveled; the gauge is hardly accurate enough for this purpose. The gauge is not linear (look at the markings), the float can stick, etc. etc. Assuming 25 mpg, you may be about to run out of gas. Suggest you refuel (fully) to get an independent (gas pump reading) verification of fuel use and to avoid being stuck on the side of the road.
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'76 2.7-->3.2
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