No, water is not a fuel.
As far as a I know methane Ch4 is not used in car fuel , it is octane which is used in car fuel C8H18 .
From fuel used in car
If ou are asking where liquids are used in a car, the answer is: 1. The engine takes fuel, oil, coolant. Those are liquids 2. The brakes use brake fluid. 3. The transmission uses ATF. 4. The air conditioner uses freon. 5. The battery uses acid. 6. The windshield washer uses cleaner. 7. The power steering uses fluid.
yes
no
Airplanes have a unique engine that can only run on a certain fuel and if you put it in your car it wouldn't be able to burn it. :)
An air tanker is an aircraft used to deliver liquids from the air, such as fuel, fire retardant, or water.
Fuel Diesel fuel
no
The fuel filter.
The most fuel efficient used car is the 2004 to 2006 Toyota Scion. It gets 30 miles per gallon combined.