Look, Joe, a 100 mpg car

I wonder if the Big 3 could start building these. Hmmm.

Cars that make hybrids look like gas guzzlers
Plug-in versions can go 100 miles on a gallon of gasoline
Sherry Boschert
Sunday, March 4, 2007

Toyota Prius owners tend to be a proud lot since they drive the fuel-efficient hybrid gas-electric car that's the darling of mainstream environmentalists and one of the hottest-selling vehicles in America. A few, however, felt that good was not good enough. They've made "improvements" even though the modifications voided parts of their warranties.
Ron Gremban of Corte Madera did it. So did Felix Kramer of Redwood City, and Sven Thesen of Palo Alto. Why? Five words: one hundred miles per gallon.
"We took the hybrid car to its logical conclusion," Kramer says, by adding more batteries and the ability to recharge by plugging into a regular electrical socket at night, making the car a plug-in hybrid.
Compared with the Prius' fuel efficiency of 50 mpg, plug-in hybrids use half as much gasoline by running more on cleaner, cheaper, domestic electricity. If owners forget to plug in overnight, it's no big deal -- the car runs like a regular hybrid.
These trendsetters monkeyed with the car for more than their own benefit. They did it to make a point: If they could make a plug-in hybrid, the major car companies could, too. And should.
Kramer, Gremban and a cadre of volunteers formed the California Cars Initiative (online at calcars.org), and in 2004 converted Gremban's Prius to a plug-in hybrid in his garage. They added inexpensive lead-acid batteries and some innovative software to fool the car's computerized controls into using more of the energy stored in the batteries, giving the car over 100 mpg in local driving and 50 to 80 mpg on the highway. The cost of conversion is about $5,000 for a do-it-yourselfer.

Read the rest of the story here:
http://sfgate.com/cgi-bin/article.cgi?f=/c/a/2007/03/04/ING44OD4AS1.DTL