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Plug-in Hybrids (PHEVs) have taken some undeserved heat lately, with the recent hullabaloo over their potential to drain U.S. water supplies. But as some readers pointed out, it all depends when you charge them.
This week’s report from Oak Ridge National Laboratory, which evaluated the impact of a substantial increase in PHEV ownership, found that nighttime charging of PHEV’s would not increase electricity demand over baseline levels. In other words, no (or very few) new power plants would need to be constructed if plug-in owners only charged their vehicles at night.

Not everyone is waiting until 2010 to get their first plug-in hybrid. As I reported previously, Hybrids Plus out of Boulder, CO, is offering conversions for the Toyota Prius and Ford Escape hybrids, turning them into 100 MPG+ superstars.
I’ve collected a little more background on Prius hybrid hacks, and a few more resources. Check out this video, which should give you a good feeling for what getting 100 MPG would be like:

Electric-car company ZAP announced it will offer $24,000 plug-in conversions for the Toyota Prius and Ford Escape Hybrids, making them plug-in electric hybrid vehicles (PHEVs).
It’s sort of like doubling your fuel efficiency for the cost of a new car…
Source: Gas 2.0

55 MPG isn’t good enough for you? Then try adding a plug to your hybrid.
The electric-car company ZAP, in conjunction with Hybrids Plus, has announced it will offer plug-in hybrid conversions for the Toyota Prius and the Ford Escape Hybrid:
Hybrid vehicles retrofitted with systems from Hybrids Plus of Boulder, Colorado can achieve a significantly greater fuel economy. In tests these systems increased hybrid fuel economy up to 120 miles per gallon in the city and up to 90 mpg on the highway. The cost for the conversion ranges from $24,000 to $36,000 depending on the vehicle and size of battery pack.
By Michelle Bennett •
January 27, 2008
Imagine if you could eke more mileage out of your Prius. If you’re like me, you’ve already tried. What if you could get a decadent 100mpg? More? A group of Prius owners in Japan are doing just that - by hacking their Priuses.
According to this CNN report, the record holder among an underground group called “Mileage Maniacs” (Japanese language only) has managed to travel 1500 miles on a single tank of gas. That’s about 116mpg; I’m green with envy! Fortunately there is a similar push in the USA and Canada to feed the demand for more efficient cars. Numerous easter eggs , and hacks are available so an enterprising Prius owner can get more mileage. There’s even a solar company and those who will modify your car into an hybrid plug-in. Some plug-ins are already on the road. Voided warranty aside, extensive green modifications require a lot of green from the owner, ranging from a $40 kit to thousands of dollars.