get an rb/nova for $50 more and get 12+gallons...like I said maybe it's changed but when i purchased mine the bearings wearing prematurely caused the pistons to get chipped.because the shards broke off in the engine. and from what i've understood sts' quality control is the problem one batch is correct and another is not...where as nova's might have 2-5 lemons out of a thousand engines made...that is all...the motors do make excellent power though