Gas prices are a supreme motivator.
Drivers tend to convert to the fuel-efficiency religion once they get severely wounded in the wallet. It’s a sad fact that environmental concerns alone are often not enough… Of course, the best ways to save on gas costs are to walk, bike, and take transit (for an example of a city that has great sustainable transportation, check out Colombia’s Medellin). But if you’re going to drive, you should get the most fuel-efficient vehicle that meets your needs. Near the top of the list, the Chevrolet Volt and Toyota Prius can be found, and thanks to relatively high gas prices in the U.S. lately, they’ve both set new sales records in March 2012.