While I've been impressed with the success of hybrid cars so far--especially the amount of energy that can be gathered via regenerative breaking--using miles-per-gallon to rate such a vehicle is highly misleading. This experimental hybrid plugs into the wall and stores extra energy in batteries. Such a concept is not new and really pushes the definition of what a hybrid car is. Would a pure electric car be rated at infinite mgp? You have to look towards the end of the article to find this admission:
Backers of plug-in hybrids acknowledge that the electricity to boost their cars generally comes from fossil fuels that create greenhouse gases, but they say that process still produces far less pollution than oil. They also note that electricity could be generated cleanly from solar power.Also of note is that the inventor, Ron Gremban, is getting about 80 mpg, not 250 mpg:
Even after the car runs out of power from the batteries and switches to the standard hybrid mode, it gets the typical Prius fuel efficiency of around 45 mpg. As long as Gremban doesn't drive too far in a day, he says, he gets 80 mpg.Overall, the engineering accomplished by Gremban seems impressive. It is unfortunate that the AP feel it necessary to sensationalize the story given the high gas prices.