Hey guys, after being in r/c for almost 40 years, I'm going to try my hand at flying. Have the Phoenix 5 on the way and the Spektrum DX5e Tx. Plan on getting the Eflight Apprentice 15e BNF to start with. Now eventually I want to strictly use gas engines. I've always had large scale cars, trucks, and boats all with very high rpm gas engines. Now my question is after reading some about gas engines for planes, why does it take GALLONS of gas to break in one of these engines? Every gas engine I've used from 23cc to 29cc has fully broken in inside of a 1/2 gallon of gas.