MPGGenie is a Flex and ColdFusion powered application that allows car buyers to estimate the daily, weekly, monthly and yearly gas costs for new cars. Visitors can input a number of variables, like the number of days they drive to work, commute distance, cost of gas. The application will then calculate the total cost of gas for the car by day, week, month and year. Users can drag and drop cars to a seperate section to compare models to each other.

The site also contains pages with specific gas information for the cars, along with a calculator that allows you to figure out the cost of gas for that specific vehicle. For instance, here's one for the Civic Hybrid.

I can think of two ways that the Flex application could be improved: first, allow users to switch between imperial and metric (who measures things in gallons or miles anyways!), and secondly allow users to filter out the list of cars by keywords. Other than those two small things, this is a really useful application - it shows gas use in a format we can all understand - estimated costs for various time periods.