There are different types of cars. Some are efficient and some are not. Yes, cars can be a little more efficient if different materials are used. But cars are are made keeping in mind the needs of customers, budget i.e. the money they can afford, and the availability of materials.
Yes you should. They will cause less pollution.
Not all cars are in need of being more efficient depending on what standpoint this is considered. Hybrids, relatively speaking are very efficient cars.
Battery powered remote control cars are more efficient and economical.
Hybrids are more efficient and more friendly to the environment. Hybrids cost more.
Lighter weight, more aerodynamic, and more fuel efficient engines, transmissions, and tires.
If you are looking for more information on What are the best energy efficient cars, the best place to find the information is on www.consumerreports.org Best & worst cars review.
Older cars are not so efficient and geneate more CO2 emissiong while new cars have more efficient engines and generates way less CO2 for the same horsepowers.
most deisle cars and smart cars. *please add to this answer I know there's more
they are faster bigger more efficient easier to drive and more expensive (mostly)
they are faster bigger more efficient easier to drive and more expensive (mostly) and more faster
When it comes to fuel efficient and luxury cars the best bet is to compare hybrid-engine designs. More and more luxury car companies are now coming out with fuel efficient hybrid-engine designs.
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.