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.
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.
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
more fuel efficient cars
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.
There are many factors that may detract from manufacturing more fuel efficient cars. Resources and money are 2 such factors.
Alternative energy cars are more fuel efficient and also more environmentally friendly than regular cars. For more infomation about alternative energy cars, please see the following: www.hybridcenter.org/hybrid-watchdog-new-epa-test.html -
the energy that cars get is from the fuel
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!
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
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.
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.