Well, my SpeedPass is on my keychain, so I pretty much need to shut the car off before getting gas. plus, I might go inside and grab a drink. My car has no issues starting, so I don't feel a need to let it run. Even up north, the car never got cold on the inside in the time it took me to fill up.
I guess we all have to find a way to be a rebel. This just isn't my method.