In fact, to equate cars and computers in this manner is to commit a Category Error. They simply don't share very many properties (save that they are both sold for money).
Don't forget modern cars are computers with wheels. Every time you drive (or ride) one, you bet your life on the correctness of the software running its various vital components.
Buggy software can cause the Lithium batteries under your seat to overheat and, maybe, catch fire. Perhaps violently.
Awesome you still have that on the road. Im guessing you live in the south? Biggest difference I always notice about cali vs northeast is the amount of old cars on the road.
By that token, asking RMS about cars in relation to his attitude towards computer would be akin to asking whether he lives in civilization or not, since everything from traffic lights to voting machines don't have open software at all. The category error is one of scale, not technical advancement.
Example of a category error (stolen from Ryle): you are handed both the left glove and the right glove, and you ask where the pair is. The pair is not a separate thing from the left glove and the right glove.
'Category error' does not mean a quantitative or scale difference at all.
Well... I still own (and use, once every couple weeks) a car that runs on ethanol and has an analog electronic injection. The radio is, most probably, its smartest part ;-)
It can be examined and changed, but it's not as easy as recompiling its engine.
http://en.wikipedia.org/wiki/Category_mistake