Maybe they just have more accurate pumps.

Others have posted here that the government only requires pumps to have an accuracy of 10%.

I speculate that businsses know this and keep pumps tweeked so we get 9 gallons when we think we are getting 10. This is legal.

Maybe BP is too ethical, or stupid, to follow suit.

Need fewer troops to support.
Drive a hybrid.
Best tank 71.65 MPG.

Before this car I spent two years learning hypermiling on my 2004 HCH1.