Fossil fuels
Hydrocarbon fuel.
Fossil fuel
Fossil fuel
Petrol
Fossil fuels
yes
Energy efficient cars are cars that gives you the most amount of travel for each unit of fuel that they use. The difference from conventional cars is that they give you more travel per unit of fuel than conventional cars do.
nonrenewable source
The most energy efficient car available is the Toyota Prius. Please see the following, for additional information: www.thesupercars.org/top-cars/most-fuel-efficient-cars
- no air pollution - no greenhouse effects - no fossil fuel - the most important alternative source of energy - it is the energy of the future
hydroenergy
It depends. The most common source is chemical energy, in the shape of Gasoline or Diesel refined from petroleum, a fossil fuel. You can have electric energy too, but as long as that electricity is coming from the combustion of fossil fuels this isn't really much of an improvement. Then there are biofuel (also chemical energy) cars as well, which basically means that there's some sort of plant material that's been processed into something combustible that can be fed into an engine.