Fuel Cost Comparison - May Surprise You

There's a fuel cost analyzer tool at www.fast-math.org which is laid out as if you are considering the purchase of a new, more fuel-efficient vehicle, although you can use it to run some as-ifs, and after-the-fact comparisons with your Prius. This converter will allow you to work in miles per gallon as well as kilometers-per-liter, can enter any number of years (how long will it take for your Prius to pay for itself?) and can be used for other applications, such as a comparison of gasoline vs diesel truck.
Have fun!
- Jeff -