Cars? Screw that!
I'd be down the local Army depot looking for the keys to the biggest and baddest that they have.
Then I could go down town and start blowing shit up, shooting shit, and generally doing some destruction. Prolly go for the Bushmaster or an ASLAV
Then I'd have to make a fortified outpost, for when the zombies emerge, or the aliens land, or whatever.
And being as the power would be out, there would be no internet. I would have a generator locally of course, so I would have to fly over to Damage's house and steal his PC, coz it has most of the world's pr0n in it's hard drives.
Maybe the FIRST thing though, would be to set up a generator, and a big ass freezer. Then go shopping for ice cream. Can't have the whole world's supply melting.
And after bulldozing the cars off the local roads, it's off to the BMW motorbike dealership!