Fuel efficiency has been a major factor for the majority of drivers in recent years, and the integration of hybrid and electric vehicles has made it easier for car shoppers to find models that suit their needs. However, the sheer number of options can be overwhelming, especially for those looking to buy used cars. Many automakers have been striving to deliver fuel-efficient vehicles in the past few years, which means there are a number of previously-owned options that drivers may find on used car lots.

2011 Mini Cooper
The Mini Cooper is a fun subcompact car that is built especially for city driving, since its small stature makes it easy to snag that barely-big-enough parking space. It was also chosen as one of the top 10 most fuel efficient small cars of 2011 by Popular Mechanics. The British car gets an impressive 37 miles per gallon (MPG) on the highway, and 29 MPH in the city, so you can zip around for days on end without having to fill up your tank. The unique, retro design of the Mini Cooper doesn't hurt its appeal either.

2012 Volkswagen Passat
The Daily Green chose the 2012 Volkswagen Passat as one of if its most fuel-efficient models, as this vehicle runs on clean diesel. It is important to note that while diesel does cost more per gallon, this is made up for by the Passat's combined 35 MPG.

Chevrolet Volt
Chevrolet introduced the Volt in December 2012, and it quickly became the most popular plug-in electric car among American drivers. Green Car Reports indicates that more than 23,000 Volts were sold in 2012, and shoppers may be able to find previously owned models on used car lots.

Other popular options for cars with good fuel economy include the Toyota Prius and Ford Escape hybrids, Hyundai Elantra, Honda Civic hybrid and Ford Fiesta. Drivers can check out these and other options at New Jersey State Auto Auction, which has a wide selection of makes and models to choose from.