It says on all websites that the fuel tank capacity is 65L, but I've never been able to fill up over 51L running the needle slightly below E. If your planning on buying a computer or piggyback, buy that first before you get it tuned, that way it will save you having to re-tune it in the future. Your not labouring the engine are you i.e. putting it in 5th at 50km/h or similiar?