The good people at CostToDrive created a free widget for Earth Day that lets you learn the real costs of each car trip you take, both in terms of dollars and carbon.

You can select your make and model and, based on your ZIP code, the CostToDrive app will calculate an approximate quantity and cost of gasoline for the given vehicle. The goal is to help people gain a more intuitive understanding of how much gas they really use and hopefully to encourage them to drive more efficiently and maybe even take less trips.

For some tips on how to save 10 percent or more on your gas just through efficient driving techniques check out my article on gas savings no-brainers.

The opinions expressed by MNN Bloggers and those providing comments are theirs alone, and do not reflect the opinions of MNN.com. While we have reviewed their content to make sure it complies with our Terms and Conditions, MNN is not responsible for the accuracy of any of their information.