I don't know the relative agility you v.numbnuts, but unless the balance is significantly in his favour, then the answer to your question is only yourself.

Of course that doesn't answer the significant question of what might be the consequences of such an act, such as that he hangs around for ages waiting for his pal with the equally appalling taste who has a tow truck (That sort-of assumes your fantasy includes your wishing to remain at the gas station. Takes all sorts.) Or that he might just grab that shotgun out of the back and ... convince you to go get his keys.