Good gas mileage, good cause–yup, it’s a good green car! The Green Car Company, which is based in Seattle, is auctioning off a 2009 Prius they’ve converted to be a plug-in using A123’s Hymotion plug-in kit. Proceeds from the eBay sale, which ends November 9, 2008, benefit Plug In America, a group working to shift consumers from gasoline- to electric-powered cars.

The Hymotion kit used in this particular Prius includes state-of-the-tech lithium-ion batteries and has been installed by certified technicians, so Toyota’s warranty is still in effect, according to Plug In America. The new battery pack has its own three-year warranty.

The dark blue car is on display all this week at the Seattle Auto Show for those who want to see it for themselves. The auction site says the new owner will be able to get 100-150 mpg and run on solely on electricity for up to 40 miles. The Prius is fully loaded, and the Green Car Company is throwing in a bunch of extras on top, including classes, shock upgrades, and heavy-duty extension cords for recharges.

In the 8-page speech, he mentions an emergency energy rebate of $500 per individual and $1000 for a couple to help with the cost of fuel and food. Where will this money come from? Big Oil’s very own pockets. That seems difficult, to say the least. He also wants to increase fuel economy standards by 4% each year, convert all White House vehicles to PHEVs in his first year, and make at least half of the federal government’s auto purchases PHEVs or EVs by 2012.

As part of his desire to increase “green collar” jobs, Obama wants all new vehicles to be flex-fuel capable, and he would work toward creating the next generation of sustainable biofuels. He also says he would work to keep American auto jobs in the country and encourage automakers to focus on fuel-efficient cars.

He also backs smart-grid technology of the kind Boulder, Colorado, is experimenting with. His plan goes much further than just car-related points, including mentions of controversial subjects like safer nuclear power and clean coal. But some of his other points are more common-sense, like assisting in weatherizing a million homes annually.

It’s not the most invigorating reading, that plan, but it’s important to know what ideas these guys have for our future. To see Republican candidate John McCain’s energy speech from June, click here.