Is gas one of your major expenses? Then maybe you should rethink your choice of wheels. While the average car gets 20 to 30 miles per gallon, a hybrid gets double that, cutting your gas bill-and your climate-changing emissions-in half. Hybrid cars combine an internal combustion engine with electric power to make sure you get the most out of the gas you put in your car. Broadening their appeal, hybrids now exist in the midsize, luxury sedan and SUV markets. That means you can have greater efficiency at any size. Even New York City's taxis are being converted to hybrids, so what are you waiting for? For your next car, make the change that pays you back every single time you drive.