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.
Diesel engines are more fuel-efficient than petrol/gasoline engines, but their NOx and particulate emissions cause problems, most notably in cities. Hybrid vehicles operating in electric-mode produce no pollution, which is good for city use. However, fuel efficiency on longer distances needs improvement.