Hybrid cars are the most popular by far of the alternative energy vehicles. They have both battery and a regular gasoline engine. Hybrids do not need to be plugged in and result in much better than average gas mileage by storing the energy used during braking in the battery, then using it to supplement the gasoline engine.
Plug-in hybride. This is simply a hybrid with a larger battery, which allows the car to be powered solely by electric power within a certain range (usually about one hundred miles) before the gas engine kicks in.
PZEV(Partial Zero Emissions Vehicle). Specialized engine controls and advanced pollution-control mechanisms mean that these are seriously clean cars, eben though it has a regular gas engine and a tailpipe. However, these cars don’t have better fuel economy.
EVS (Electric Vehicles). These are emission-free cars, they run entirely on batteries.
Eco-friendy alternatives to gasoline
Ethanol. Made from corn (but can be made from other kinds of plants), ethanol can be mixed with gas at many concentrations, which is why you’ll see different designations for it (85 percent ethanol – E85). Cars that can use high concentrations of ethanol (above 10 percent) are called flex-fuel, they can burn any mixture of ethanol and gasoline. Critics of ethanol say it’s not particularly energy saving, since it takes so much energy to grow corn, but supporters have shown that it is still more efficient than gasoline, and around 15 percent better in terms of carbon print.
Biodisel. Two kind of biodisel, straight vegetable oil (SVO) and waste vegetable oil (WVO), can be burned in most cars with diesel engines (some cars do need a minor modification).
SVO is a refined product made from vegetable crops (soy, corn, algae). Some estimates show that growing plants for biodisel (which entails the use of pesticides, herbicides, fertilizers and lots of water) takes more energy than is generated by the fuel they produce, so researches are looking into ways of creating biodisel from plants that are less energy intensive.
WVO comes from deep fryers at potato plants and fast-food restaurants to the tune of eleven billion gallons a year. It is a really eco-friendy option, as otherwise the oil would be discarded. Moreover, the exhaust from the WVO-using car smells like french fries. To run on WVO, cars need some modification.