I know that my tank holds somewhere between 10.5 and 11.2 gallons of fuel.
As I get near 9 gallons, I slowly release the trigger to reduce splashing. I then give it fuel in stages. I try to shut off at the first click. *
If you do your math, and the figures just seem a little too high or low, the pump reading may be off. I once filled my tank and found out that the meter was off. The reading had indicated that I had filled up with less fuel than I did. This resulted in an error of several MPG. I therefore would try more than one pump.
One thing I also do is to try and fill in the mornings when the air is cool. This reduces the release of fumes from the tank.
*The problem with this is that a lot of the gas pumps around here do not shut off when they are supposed to, and you never get the 'click' . Instead, it just spills all over your car.
The emissions that result from this are extremely bad since the vapors are going straight into the atmosphere without any filtration. ( Most likely creating more pollution than you would create driving for several miles. )
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