The absolute best cars in terms of fuel efficiency are the newest fully electric vehicles. As they don't run on any gasoline at all, there is really no comparison for these.
There are many fuel efficient cars on the market. In 2012 the most popular cars included the Ford Focus Electric, Scoin IQ EV, Toyota Prius, Honda Fit EV and Ford Fusion.
Check out this website: http://www.consumerreports.org/cro/2012/02/the-most-fuel-efficient-SUVs/index.htm. This lists most of the hybrid cars and gives you a price estimate.
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 2012 Mitsubishi is one of the most fuel efficient SUVs in the market. It has 112 MPG and is very fuel efficient. I recommend the 2012 Mitsubishi for your needs.
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.
The most fuel efficient cars can be compared using the motoring magazines but for comparisons tailored to specific vehicle usage, you cannot beat the comparison websites.
Any car that is labeled as a "hybrid" is going to be more fuel efficient. Some of the most fuel-efficient cars of 2011 are the Nissan Leaf, the Telsa Roadster, the Chevrolet Volt, the Smart car, the Toyota Prius, and the Honda Civic Hybrid.
The most fuel efficient cars on the road are smaller cars with either hybrid (gas/electric) or diesel engines. Examples of such cars are the popular Toyota Prius(44/mpg) or the Volkswagen Jetta(34/mpg) diesel.
The most fuel efficient vehicles on the market today are usually hybrids. However, many small and economy sized vehicles on the market are not hybrids but are very fuel efficient as well.
most deisle cars and smart cars. *please add to this answer I know there's more
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.
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.