Seriously, take a moment to calculate how much stopping at a gas station takes out of a trip.
For example, when I have to get off of a freeway in order to get gas, I usually have to navigate an intersection and might have to sit through a traffic light.
In places I used to live, getting gas meant turning left instead of going right on red. Then leaving the gas station meant sitting through another stop light or two.
You might not have to put up with this if you live somewhere rural, where you're not dealing with divided highways and traffic lights.
Otherwise, getting gas is a chore.