Quote:
Originally Posted by suspendedhatch
First off, no, it has absolutely no effect on FE.
Secondly, almost no one who has a spare tire in their trunk keeps it inflated. That spare is useless to you unless it has 60 psi of air pressure in it. When it's low, it looks exactly the same as when it's not. When's the last time you checked yours?
Thirdly, you're better off carrying a battery jumper / air compressor "rescue pack". If for no other reason that to help someone else out. It's better than jumper cables in that you don't damage your own vehicle in the process.
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Actually, I check my spare about once a month. Of course, I have to wonder about the spares, since in the case of the Cad, at least, it is over a quarter century old...
I've never yet damaged any car using jumper cables. I always clamp onto the battery terminals...I know you are not supposed to, (possible ignition of hydrogen gas...oh, the humanity!) but I learned about using jumper cables back when some cars still had positive grounds...