Diesel powered engines, while commonly considered to be less environmentally friendly than those operating on other fuels, are in fact "more powerful and fuel-efficient than similar-sized gasoline engines" according to the Environmental Protection Agency's FuelEconomy. gov website. But there are a number of recommendations that may further improve the efficiency of the diesel engine, helping cut costs and reduce environmental impact. As the same fuel-saving tips presented to gasoline engines can help enhance diesel engine economy too (see General Motors' energy efficiency tips in the "Resources" section below), there are extra steps that are specific in order to diesel engines.