Gas Mileage MPG Calculator in Google Docs

I created a Google docs spreadsheet to calculate miles per gallon (MPG). The MPG calculator is here. It was something I started to see what kind of miles per gallon my VW Jetta is getting. It's averaging 21 MPG in the city, according to the Google docs calculator. The setting is set to Share with Everyone, so grab a copy for yourself and start seeing if you can get green (which was my goal) by making sure your tires are inflated, that you're not gunning the engine and generally not speeding, all of which are factors which will improve your MPG car rating and reduce the amount of money you're spending on fuel.