250+ miles to a tank.....can of worms opened

[Janet]

This could be an urban myth ... or not. I heard once that if you fill up as quickly as you can a fuel pump tends to over-register the amount dispensed, and if you fill up slowly you have a chance of getting a bit more actual fuel out for the same measured (and charged for) amount. The chances are that if your tank is very nearly empty you'll use the pump at a higher flow rate than if you're only putting a small amount in. But, like I say, I don't know whether that's true or just a myth.