Crazy story. I can't believe he followed you so far and intensely. Road rage is like speeding tickets, you can take measures to reduce your chances of encountering them, but if you drive enough you WILL run into it eventually. I think if you're carrying, you should always carry a secondary defense. I think guns should mostly only (few exceptions) be used in your own home. Too many bystanders out there (plus at a gas station!? no way dog!). Easier to pull the trigger on spray than a trigger on a gun knowing you might kill the person. Then you might seize up, and if not terrified the attacker would only be more angry...