We have a really old car we want to get rid of and trade it in for a shiny new Prius or Honda Insight (when they come out). I'm not a tree hugger and while it's cool that it's less harmful to the Earth, I'm more interested in whether or not they save me money. It's easy to do the math when it's a Honda Civic vs. Honda Civic Hybrid, usually the premium you have to pay for the hybrid won't be worth it. The Prius and the Insight don't have a non-hybrid equivalent so it's a little harder for me to gauge. For the price, $28,645 for the Prius fully-equipped and about a few thousand less for the Insight, are there other cars in their class that would cost less to drive?