People who have bought fuel-efficient vehicles may be finding that their cars are able to withstand the test of time in terms of investments, as some individuals are turning a profit when selling a fairly new environmentally friendly vehicle.

The New York Times reports that used car values are increasing dramatically for fuel-efficient automobiles, as there is a high demand from American consumers due to the rising gas prices.

For example, compact cars that are between one and five years old are now worth 30 percent more than they were six months ago, according to the news source.

"There's just so many things hitting the market all at once," Alec Gutierrez, manager of used-car pricing at Kelley Blue Book, told the news provider. "For those really hot, in-demand cars, we're seeing one- and two-year-old vehicles that are selling for very close to [sticker price.]"

Consumers who are looking to purchase a used fuel-efficient car may want to check out New Jersey Auto Auction, which has a variety of models that will be sure to fit anyone's preference.