1.   Over a million gasifier units, usually powering road vehicles, were used during the Second World War.

2.   NGVs are also popular with drivers, who comment that they are smoother and quieter than petrol or diesel powered vehicles.

3.   At the observatory, all vehicles are powered by diesel engines, which have no spark plugs.

4.   Fuel cells use hydrogen and oxygen to create electricity that powers a vehicle without creating pollutants.

5.   Fuel-cell technology takes gasoline and creates an electric charge to power the vehicle.

6.   Millions of gallons of gasoline are wasted every year in engines powering vehicles on improperly inflated tires.

7.   More than two million vehicles worldwide are powered by natural gas.

8.   These fun-to-drive vehicles are powered by a four-cylinder engine matched to a five-speed manual transmission.

9.   When you start it up, the vehicle is powered by its two front wheels.

10.   Fuel cells use hydrogen, extracted from fuels such as gasoline and diesel, to generate electricity to power a vehicle.