What are your favourite things to buy at the gas station?

Condoms and nacho cheese.

Er...gas?

- Yet another mind-bending puzzle solved by Captain Obvious! [rousing music plays]

Gas.                   

I don't have a favorite thing but I'll occasionally get myself a soda when I'm doing errands.

I've never bought anything but gasoline and used the rest rooms . . .  walking through the store areas I can see that it's all crap and overpriced.