Mine was just your run of the mill LS swap/truck motor.. wasn't anything too impressive from that standpoint but it was a completely rebuild short block from LQK with the cam added. I believe the guy ran it too lean and killed it. When he was here checking it out the day he bought it, he kept asking me about gas mileage because it was going to be his daily. I told him I really didn't know as I had build it as a toy and wasn't my main driver. We stayed in contact for a bit after he took it home, and he had mentioned a few times that he was messing with the fuel curves to try to get the gas mileage up. I was a shame.