American AI is usually American Airlines, and usually appears because of a baggage fee paid at the airport, or a purchase made during a flight. posted 09/11/2012 Helpful (4)
Electric motors are in general, a lot more efficient that internal combustion engines. An average combustion engine has about 18â20%. A formula one engine, has about 50% of an efficiency.
We have separated these engines into three categories. 1  Side Valve Engines are designed for short run applications like cutting grass. 2  OHV Engines are quieter engines that produce less emissions.  OHVI Engines are the quietest and most efficient engines in their class.