well lets see Duratrax torq .21 has 10 gallons still strong !!! love this cheapo motor set it and forget it starts on a pull or 2 every time

First TRX 2.5 didnt make it through break in 2nd TRX 2.5 is on gallon number 7 and runs like a raped ape but always tinkering with settings

.21 force 4 gallons so far good runner but hard to start from day one

.21 hyper 8 port 2 gallons wasnt impressed at all its toast

Had an M16 lasted 17 gallons then got run over by a dump truck

every time i spent money $150 plus for an engine i was nothing but dissapointed !!! im a back yard basher and take really good care of my stuff !!!! $100 (or close to it) engines are all i will buy from my experience i have WAY more fun and Way less agravation