I agree... Automobiles are quite a bit more expensive to own & operate than PC's.
For the price of a new set of tires you can get a pretty nice computer.
Imagine how much more expensive fuel will be judging by the recent increases in price.

You could even disconnect from the power grid, and generate your own electricity via photovoltaic, hydroelectric, wind, or giant hamster wheels powered by livestock, which can be another food source.

But if the oil stops flowing, or the price becomes astronomical, your cars aren't going anywhere but downhill, unless you use livestock - a la horse & buggy.

That aside, I'm sure that if such a scenario took place, we'd be too busy trying to survive to worry about the loss of our electronic cyber world.
Hmmm... Maybe I should add a few netbooks to the doomsday cache? Hehe!