You can easily get more than 8 gallons out of an engine, you just have to make sure it always gets lots of lubrication and never runs lean or too hot. If heard of ppl running more than 20 gallons on one complete engine, minus the break-in period. It just comes down to how often you use it,m how its tuned and how the engine is treated, use it hard and it lasts less. Use it easily, it will last longer.