...The point is that even if you save 1% on fuel how much higher will the engine failure rate be? If the engine failure rate also increases by 1% how much fuel/energy does it take to manufacture and replace 1% of the engines. A ballpark guess is a net loss. Same broken logic as the electric or alcohol crowd IMO. If you're going to scientifically analyze something make sure you take ALL the variables into account. Otherwise it is just agenda feelgood baloney.