A little while ago we had an extensive post on hybrids, since a lady was shopping for a new car and asked us the fundamental question of cost-effectiveness. Comparing a Honda Fit with a Prius, it would take me 22 years to make it cost effectve, not counting the new battery the Prius would likely need. Also, many Americans live in areas with cold winters; the fuel mileage penalty for a hybrid is severe in winter driving. We did conclude that a Prius would be an ideal taxi in Seattle, Portland, or any coastal city with a mild climate. The payback on taxi service at 100,000 miles a year of driving is great.