Clark's daughter has his Honda Civic hybrid at school and she's happy to be getting about 45 miles/gallon. It seems that hybrids with good fuel economy are now selling like gangbusters. Remember back just a few years ago when this wasn't the case? Ford had to offer incentives just to move their Escape hybrids. Now The Washington Post reports the Escape is so hot that dealers can't keep up with the demand. In fact, the vehicles are selling for thousands of dollars above the list price because people want to save money on gas. Psychologically it may feel OK to pay a little more now with the promise of bigger savings down the road, but Clark thinks you should really crunch the numbers before you make this kind of purchase. Buying with your emotions isn't advisable, nor is overpaying for new technology. Take the rational approach by doing some smart comparative auto shopping on a website like Edmunds.com. The same thinking applies when deciding whether to dump your current gas-guzzling ride for a new and more fuel-efficient vehicle. Look for a similarly depreciated vehicle and try to do a trade where you get an older set of wheels that's more fuel-efficient than your current car.