Yes you should. They will cause less pollution.
In a basic way, but fuel efficient cars usually refers to gasoline or diesel cars that get great mileage per gallon, energy efficient refers to any vehicle including hydrogen, electric, and hybrid.
Car companies manufacture fuel efficient cars to conserve the limited amount of gasoline we have left, reduce greenhouse emissions, and provide drivers with a way to save money on gasoline costs.
http://www.fueleconomy.gov/feg/best/bestworstnf.shtml is the government website for fuel rankings and this is the direct link to the list of the most fuel efficient cars!
There are several places you can look online to find a list of the most fuel efficient cars. Check FuelEconomy.gov, they have a pretty extensive list. CNN recently did a story on the eight most fuel efficient cars. Check out their report.
Even though fuel efficient cars should sound reasonable with gas prices this high, they have this thing they like to call their "man card", and apparently sports cars make them look tough and manly, while smart cars are degrading and sissy. They are a complicated specimen.
The following link will take you to a site that lists the best--and worst-- fuel efficient cars. www.fueleconomy.gov/feg/bestworst.shtml
The Nissan Leaf and the Chevrolet Volt are rated among the best of fuel efficient cars. Additional information is available at the following: www.thedailygreen.com
Fuel is so expensive these days that finding the best MPG cars has become a necessity. As well as learning the most fuel efficient way to drive, checking the motoring magazines and comparison sites can help you to find the best fuel efficient cars to suit your lifestyle.
Some of the most fuel efficient cars are the smart cars like 2013 Smart ForTwo, Honda Fit EV, and the Scion iQ. These cars are electric so the fuel they use is used to create the electricity they run on.
Almost all the Japanese cars! ;D
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.