That seems to be the consensus. As far as a fuel supply goes, if you have a working vehicle and hundreds, perhaps thousands, of vehicles are stranded, draining/siphoning those fuel tanks will keep you going for quite a while. If you can stock up on extra fuel cans and a stabilizer, you might be able to maintain your vehicle for a year or more.
The trick will be dealing with stalled vehicles on the road, roadblocks, and people who decide they want your car, no matter what. :)
They’d have a hard time driving it with a bullet in their braincase.
I've given a lot of thought to the "perfect" vehicle for a post-apocalyptic event, and I've concluded that there isn't any single vehicle that fits the bill. I see a small motorcycle -- no bigger than 500cc, maybe even a dirt bike -- for maneuverability, fuel efficiency, and minimal storage requirements. But when the weather gets crappy or you need to haul something, a large 4wd pickup with some heavy off-road cleats. For those big jobs, and to clear the road ahead, a heavy-lift towtruck. Or a bulldozer.
Plus a variety of smaller, fuel-efficient cars for foul weather in-town or nearby driving.