Fuel dispensers are used to pump gasoline, diesel, compressed natural gas, CGH2, HCNG, LPG, liquid hydrogen, kerosene, alcohol fuel (like methanol, ethanol, butanol, propanol), biofuels (like straight vegetable oil, biodiesel), or other types of fuel into the tanks within vehicles and calculate the financial cost of the fuel transferred to the vehicle. Fuel dispensers are also known as bowsers (in some parts of Australia & in New Zealand), petrol pumps (in most Commonwealth countries) or gas pumps (in North America). Besides fuel dispensers, one other significant device which is also found in filling stations and can refuel certain (compressed-air) vehicles is an air compressor, although generally these are just used to inflate car tires (tyres). Also, many filling stations incorporate a convenience store, which like most other buildings generally have electricity sockets; hence, in some cases, plug-in electric vehicles can be recharged.