Quote:

I'm pretty sure the hose is emptied back from where it came after every pump. Its the same even on a regular hose, safety and all that.



No.
You know that handle that you squeeze? That's the shut off valve. The fuel that's in the hose and the pump stay there until it's displaced by more.
You get about 1/3 gallon of whatever the person before you bought. It's really not enough to be concerned about, but if it makes you feel better, follow a Porsche or BMW or something else that probably takes premium.

Contra todo mal, mezcal; contra todo bien, también