Fuel efficient cars have become increasingly popular recently due to consistently high gas prices, but experts say the number of hybrid and electric vehicles is only just starting to rise. Exxon Mobil predicts that as many as one out of every two cars will fall into either category by 2040, The Associated Press reports.

Should the prediction come to pass, there will be a significant increase in the number of hybrids currently on the road. The vehicles, which use a combination of gas and electricity to power their engines, currently account for only about 1 percent of cars today.

Part of the reason for the expected increase is that President Obama has placed added pressure on auto manufacturers to produce cars that get better gas mileage. The requirements insist that manufacturers' fleets have an average fuel efficiency of 54.5 miles per gallon by 2025, a significantly higher rate than today. The edict has apparently had an effect.

"It's evidence that what the Obama administration is doing with fuel economy is working," Deron Lovaas, Federal Transportation Policy Director at the Natural Resources Defense Council, told the AP.

It will still be some time until hybrids and electronic vehicles dominate the highway but there are plenty of ways that you can save money by increasing your fuel efficiency. Perhaps most significantly, keeping your tires properly inflated has proven to go a long way to maintain a high gas mileage.

Of course, getting behind the wheel of the right car can have a big impact as well. New Jersey State Auto Auction will likely have the fuel-efficient ride you're looking for an an affordable price, and every car is Carfax certified so you know you're getting a reliable car.