Typically a "fuel-efficient" car will get at least an average of 30 MPG. Anything below that is not considered fuel-efficient. Anything under 20 MPG is labeled a "gas guzzler."
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.
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.
Almost all the Japanese cars! ;D
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.
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.
You can get top fuel efficient cars by visiting Smart Car's website. Smart Cars are a cross between a small car and a compact SUV and get lots of MPG. These cars are safe to drive and are very eco-friendly.
Lighter weight, more aerodynamic, and more fuel efficient engines, transmissions, and tires.
According to the government, the minimum MPG a "fuel efficient" car right now must get is 27.5. That has been the case for almost 20 years. Next year it will change to 30.2 MPG. Most cars you find will exceed those numbers.