[roundout]

[ QUOTE ]
Why can't auto gas be used in high altitude aiplane engines? (even if the timing has been adjusted to prevent detonation)

lead acts as a lubricant. without the lead in the gas, the engine doesn't get all the lubrication it's designed to receive. i THINK there were some cases of people converting to mogas and then not making TBO because of valveguide problems dealing with insufficient lubrication. don't quote me.

You leave the mixture rich and turn the mag key to OFF. The engine keeps running, what's wrong?

busted p-lead

Where does the magneto get it's electricity?

it generates its own electricity. the mag is driven by the engine, which in turn, helps the engine run (way simplified, obviously).

Who is ultimately responsible for the mechanical condition of the airplane?

the owner/operator