nospam
however, they don't need to know how to fix the car or tune it to perform the way they want. that's for the mechanics to do.

PeterN
It's hard to agree, less. While you don't have to know how to design and build a car, you can save an lot of money, if you have a basic understanding of the principals that make it work. e.g. On my station car the remote start stopped working and the cruise control wold not stay on. the mechanic was ringing the register, as he suggested what "had to be done." I asked him to test the battery, since I figured the common denominator waas an electrical problem. Bingo!

nospam
i didn't say there weren't advantages to knowing how to fix cars.

if someone knows how, they might be able to fix things on their own and can avoid the mechanic entirely.

however, it's not *required*.

PeterN
not required for what?