Track your mileage, get better gas mileage! Check out this App in action on heroku:

================== mileagetracker.heroku.com ==================================

Ajax is just plain awesome, what more can I say!

How I made this app...

-- Creating a new XMLHttpRequest Object on submit of the form -- Passing the form values as a query string to the RESTful create action in the Mileage controller -- Calculating the three calculated values on the fly in the controller -- Parsing the json file sent as a callback -- DOM Manipulation!! -- Returning the submit action as false to not submit the form (Lots of small clean up tasks...)

== A simple yet elegant App