Suns_PSD
Well-known member
I hand calculated my mpg and it was dead on to the computer, as it should be. I've used the exact same pump and technique for every fill up on this vehicle.
One thing that can happen is gasoline can evaporate. Not sure if emissions control systems still allow this on modern cars but historically letting a vehicle sit a long time would significantly reduce mpg just because gasoline would be lost to evaporation.
The engine mpg calculators are only going off the fuel that runs through the engine only.
I would suggest if your hand calculated mpg is off more than a tenth or so from your computer that it's related to your fueling source or something simple like the angle your truck is parked at, fill speed, etc.
One thing that can happen is gasoline can evaporate. Not sure if emissions control systems still allow this on modern cars but historically letting a vehicle sit a long time would significantly reduce mpg just because gasoline would be lost to evaporation.
The engine mpg calculators are only going off the fuel that runs through the engine only.
I would suggest if your hand calculated mpg is off more than a tenth or so from your computer that it's related to your fueling source or something simple like the angle your truck is parked at, fill speed, etc.
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