I have a new Honda Civic Hybrid and I am trying to figure out just how
accurately the electronic gauge displays mileage per gallon. Please excuse
me for posting here but I didn't get much info from the Honda group so I am
trying here because Cadillacs have had electronic fuel computers for quite
some time. I've always calculated mpg whenever I fill the tank. I know
that the calculations have error/variation since the gas pump cut-off won't
always fill the tank to the same level so the amount of gas used is off.
When I compare the fill-up calculations to the electronic gauge readings,
they are always different sometimes by almost 2 mpg (both higher and lower).
I assume the gauge uses some kind of flow meter sensor which I hope it is
more accurate in determining gas used than the pump fill-up method.
Would appreciate any comments/info on Cadillac computer accuracy which could
be similar to my Honda. Also curious to know just how these gauge and
sensors work. Thanks -V
Probably the only sure way to know miles per gallon is to drain the gas
tank, put in five gallons of gas and drive till the motor quits and then
divide 5 into the miles traveled.
This too has a drawback. For it will give you the numbers for the weather
conditions, speed, terrain and quality of the gas of that day.
Alas, it is not.
Best way to determine real, overall mileage is to do it over a LONG period
of time and several fillups. This minimizes the over/under variations of
how full the tank really is. With my Seville, the electronic MPG reading is
always slightly higher than the manual calculation.
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