I think an aspect worth pointing out is the convenience of FBO refuelling in the US. Unlike UK, where 'customer service' extends to (begrudgingly) switching the pump on for you (if they are not too busy), FBO's in the US expect to refuel your plane while you are doing something more productive.
It's all part of the genuine utility of light aircraft as a means of transport in America and probably leads to fewer fuel exhaustion incidents compared to UK and Europe, where 'topping off' can be a gruelling experience.