What is the Difference between engine powered airplane and jet airplane?

This also means that diesel cars run just as cleanly as gasoline-powered models.In addition to the new fuel, the Environmental Protection Agency (EPA) has required car manufacturers to design new diesel engines. The current crop of diesels are quieter, cleaner and perform better. Moreover, these engines are 50-state compliant which means that they're approved for sale in states such as California with the toughest anti-pollution laws on the books.

Car manufacturers have essentially reinvented the diesel engine by bringing in direct injection, fuel injectors, common rail fuel distribution and other technologies. Direct injection means fuel is injected directly into the cylinder, eliminating engine knock, delivering more power and increasing fuel efficiency. Some manufacturers have taken the new technologies further by installing two-stage turbochargers, by reducing the compression ratio and in removing excess weight.

Improvements in injection technology has enabled Mazda(http://www.mazda.com/mazdaspirit/skyactiv/engine/skyactiv-d.html) to deliver new diesel engines that run better and can still start up on cold mornings. Take two engines of similar size -- one a diesel and the other designed for gasoline consumption -- and the diesel is about 30 to 35 percent more fuel efficient. The diesel design is what gives these engines a fuel economy edge as such engines makes use of the compression heat to begin ignition that burns the fuel injected into the combustion chamber.

Gasoline engines require a spark plug to ignite the air-fuel mixture. Diesels also operate at a much higher compression ratio and deliver more torque at lower speeds, ideal when towing. One of the most striking differences between gasoline and diesel models can found the Chevrolet Cruze(http://autos.answers.com/new-cars/5-best-diesel-cars-by-highway-mileage), a compact sedan.

A Cruze outfitted with a 1.8-liter gasoline engine and paired with an automatic transmission delivers 22 mpg in the city and 35 mpg on the highway. The Cruze diesel is rated at 27 mpg in the city and 46 mpg on the highway. That makes for a 31 percent difference in highway fuel economy.

Besides the Chevrolet Cruze, car manufacturers such as the Volkswagen Group, BMW and Daimler offer diesel options. Brands include Audi, BMW, Mercedes-Benz and Volkswagen, with new models coming from Jeep, Mazda and Porsche. Diesel engines are also available in heavy-duty versions of Ford, GMC, Chevrolet and Ram pickup trucks.

Expect more models from more manufacturers to become available as consumer acceptance increases. New diesel-powered models are more fuel efficient, run quieter and emit far fewer pollutants than previous generation models. Diesel fuel costs more than regular grade gasoline and such models are priced higher too as are gas-electric hybrid vehicles.