Whether contemplating the possibility of a Lexus Prius or dreaming up a Prius convertible, people sure do like to tinker with Toyota's halo car. Of course, for many, the reason to mess with the hybrid is to squeeze more miles per gallon out of the car.

According to CBS Chicago, two brothers from Du Page county, Illinois - Chris and Andrew Ewert - have modified a Prius to get 100 mpge (the "e" here being very undefined in the original source), simply by adding more batteries (battery type? also undefined) and a charger to the stock model. While techy details are not forthcoming about this particular PHEV conversion, at least one message comes through nicely: "My brother and I built this, and car companies should be able to do it, too," Chris said.

If you'd like to see some technical information on how a Prius conversion looks like, check out what Kim Adelman is doing.

[Source: CBS Chicago]

This is a post for all of the American city officials we have who read AutoblogGreen (or readers who know someone in city government). The Automotive X Prize is looking for cities in America to host stages of the fuel-efficient vehicle race in 2009-2010. An official Request for Proposal (RFP) will be released at the Detroit Auto Show in the next few days.

What will your city get for hosting a stage? Publicity, mostly. The race will go through "ten U.S. cities while being broadcast to a global audience in 2009 and 2010, building consumer demand for vehicles in the competition and demonstrating many practical, clean and affordable vehicle options. This opportunity represents a visual, hands-on forum for Host Cities and individual administrations to drive public behavior toward reducing environmental impact."

If you want to be a part of the race but don't happen to work for an American city, don't worry. The organizers are
"seeking national, regional and local sponsors to underwrite the stage race competition," which means they'll be happy to take your money. Details after the jump.

Related:

• Update from the Automotive X Prize team
• AutoblogGreen exclusive Q&A with the Auto X Prize's Mark Goodstein

[Source: Auto X Prize]