Fuel gages are calibrated at empty, so at full they are not so accurate. Which means takes long time to come off full and then the sudden drop to half tank. Now you fill up at half tank and you think 8 gal. from 16 gal. tank. Now you go pass 10 gal and you think there is hole in the tank or the pump is ripping you off? Some of the more expensive cars have computerized calculators that tell you how many miles and gallons left to empty. But again calibration sometimes gets screwed up even on them.
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