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Originally Posted by judybe83
our computer is very (VERY) optimistic it always shows .9 to 1.9 BETTER mpg  than manual calculation, jb calculates and documents every tank computer and manual. the computer has only got it right once!!
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The OBC uses a flow meter to calculate MPG and if anything it is consistent--manually dividing the gallons at the pump into the miles traveled is not very accurate--every pump nozzle shuts off at different times and you never get a fillup unless you overflow the tank--and that will trip a fault in the computer. Also the gas from the underground tank may be cold--pump it into your tank and it will warm up and expand--
BTW this is the 21st century--computers replaced pencil and paper
