RE: How long has your engine lasted??
I have never bought an engine or any rc for that matter (except my mini giant) brand new. All have been used, and I have used 2 1/2 gallons on one of my mad forces, still alot of compression, 3 gallons on a Megatech M16 (on an rc10gt, which the m16 smoked the fantom 12) and its still running strong, and about 3 tanks on my xtm 24.7, also put about a gallon in an old kyosho flat head.