I just found out about this... and I was wondering if anyone bought a terrapass. If you don't know what they are the link is here http://www.terrapass.com/index.html Basically you buy a package for your fuel economy and that money is invested into alternative fuel projects. Those projects in turn prevent extra CO2 from entering the atmosphere, projects you help fund, making up for what you added. I would have to get the $39.95 one (my civic is rated at 28, but with my driving i've gotten 32-34 mpg).