Experimental Hybrid Cars Get Up to 250 Mpg

[Marc]

Experimental Hybrid Cars Get Up to 250 Mpg

By TIM MOLLOY, Associated Press Writer Sat Aug 13, 7:08 PM ET

CORTE MADERA, Calif. - Politicians and automakers say a car that can both reduce greenhouse gases and free America from its reliance on foreign oil is years or even decades away. Ron Gremban says such a car is parked in his garage.

It looks like a typical Toyota Prius hybrid, but in the trunk sits an 80-miles-per-gallon secret — a stack of 18 brick-sized batteries that boosts the car's high mileage with an extra electrical charge so it can burn even less fuel.

Gremban, an electrical engineer and committed environmentalist, spent several months and $3,000 tinkering with his car.

Like all hybrids, his Prius increases fuel efficiency by harnessing small amounts of electricity generated during braking and coasting. The extra batteries let him store extra power by plugging the car into a wall outlet at his home in this San Francisco suburb — all for about a quarter.

He's part of a small but growing movement. "Plug-in" hybrids aren't yet cost-efficient, but some of the dozen known experimental models have gotten up to 250 mpg.

They have support not only from environmentalists but also from conservative foreign policy hawks who insist Americans fuel terrorism through their gas guzzling.

And while the technology has existed for three decades, automakers are beginning to take notice, too.

So far, DaimlerChrysler AG is the only company that has committed to building its own plug-in hybrids, quietly pledging to make up to 40 vans for U.S. companies. But Toyota Motor Corp. officials who initially frowned on people altering their cars now say they may be able to learn from them.

"They're like the hot rodders of yesterday who did everything to soup up their cars. It was all about horsepower and bling-bling, lots of chrome and accessories," said Cindy Knight, a Toyota spokeswoman. "Maybe the hot rodders of tomorrow are the people who want to get in there and see what they can do about increasing fuel economy."

The extra batteries let Gremban drive for 20 miles with a 50-50 mix of gas and electricity. 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.

"The value of plug-in hybrids is they can dramatically reduce gasoline usage for the first few miles every day," Gremban said. "The average for people's usage of a car is somewhere around 30 to 40 miles per day. During that kind of driving, the plug-in hybrid can make a dramatic difference."

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.

Gremban rigged his car to promote the nonprofit CalCars Initiative, a San Francisco Bay area-based volunteer effort that argues automakers could mass produce plug-in hybrids at a reasonable price.

But Toyota and other car companies say they are worried about the cost, convenience and safety of plug-in hybrids — and note that consumers haven't embraced all-electric cars because of the inconvenience of recharging them like giant cell phones.

Automakers have spent millions of dollars telling motorists that hybrids don't need to be plugged in, and don't want to confuse the message.

Nonetheless, plug-in hybrids are starting to get the backing of prominent hawks like former
CIA director James Woolsey and Frank Gaffney, President Reagan's undersecretary of defense. They have joined Set America Free, a group that wants the government to spend $12 billion over four years on plug-in hybrids, alternative fuels and other measures to reduce foreign oil dependence.

Gaffney, who heads the Washington, D.C.-based Center for Security Policy, said Americans would embrace plug-ins if they understood arguments from him and others who say gasoline contributes to oil-rich Middle Eastern governments that support terrorism.

"The more we are consuming oil that either comes from places that are bent on our destruction or helping those who are ... the more we are enabling those who are trying to kill us," Gaffney said.

DaimlerChrysler spokesman Nick Cappa said plug-in hybrids are ideal for companies with fleets of vehicles that can be recharged at a central location at night. He declined to name the companies buying the vehicles and said he did not know the vehicles' mileage or cost, or when they would be available.

Others are modifying hybrids, too.

Monrovia-based Energy CS has converted two Priuses to get up to 230 mpg by using powerful lithium ion batteries. It is forming a new company, EDrive Systems, that will convert hybrids to plug-ins for about $12,000 starting next year, company vice president Greg Hanssen said.

University of California, Davis engineering professor Andy Frank built a plug-in hybrid from the ground up in 1972 and has since built seven others, one of which gets up to 250 mpg. They were converted from non-hybrids, including a Ford Taurus and Chevrolet Suburban.

Frank has spent $150,000 to $250,000 in research costs on each car, but believes automakers could mass-produce them by adding just $6,000 to each vehicle's price tag.

Instead, Frank said, automakers promise hydrogen-powered vehicles hailed by
President Bush and Gov.
Arnold Schwarzenegger, even though hydrogen's backers acknowledge the cars won't be widely available for years and would require a vast infrastructure of new fueling stations.

"They'd rather work on something that won't be in their lifetime, and that's this hydrogen economy stuff," Frank said. "They pick this kind of target to get the public off their back, essentially."

[db]

Which brings up the question. How much would you pay for a car that got 250 MPG? Folks pay $50,000 + for vehicles that get less (but may offer more protection in an accident). Based on my figures (40,000 miles @ 20 mpg vs 40,000 @ 250 mpg, and $2.50 per gallon), I should save about $4600 per year in fuel. That's like double my salary!

[Jennifer Kirley]

Originally Posted by db

Which brings up the question. How much would you pay for a car that got 250 MPG? Folks pay $50,000 + for vehicles that get less (but may offer more protection in an accident). Based on my figures (40,000 miles @ 20 mpg vs 40,000 @ 250 mpg, and $2.50 per gallon), I should save about $4600 per year in fuel. That's like double my salary!

If I looked at a $20K vehicle that I'd drive 20,000 miles a year and it gets 22 MPG and then spent $30K on a vehicle that gets 230 MPG at $2.50 a gallon prices, the yearly $2,055 savings would regroup the extra $10K spent in just under 4 years.

A $2,000 tax break for buying the hybrid sweetens the deal, reducing payback time to 3 years. I'd end up with a car having 80,000 miles on it (my Stratus has about 122,000 now) and in the black. So long as repair costs don't kill me I'd be in pretty good shape because I feel sure gas prices will only rise.

I'd consider the diesel engine conversion to vegetable oil, but I understand there is a pesky thickening problem in cold weather.

[Tim Folkerts]

I don't think the numbers look as impressive as they might seem. I wish science writers would take the time to analyze the numbers they have!

$0.25 is about 3 kWh, which is about 10^7 Joules of energy

A gallon of gas is a little over 10^8 Joules of energy.

So the energy in the electricity is about the equivalent of about 1/10 of a gallon, or $0.25. Wow! I can replace $0.25 of gasoline with $0.25 of electricity.

Now an electric motor is more efficient than a gas motor, so the 10^7 Joules of energy in $0.25 of electricity will get you farther than the $0.25 worth of gasoline. So gas + electric will get you a few more miles/$ than a pure gas car. But not by leaps & bounds. And now you need expensive batteries & long charging times.

You simply can't add $0.25 worth of electricity to a $25 tank of gas and expect to double or triple the mileage. It is just bad science!



And numbers like "250 mpg" are almost meaningless for cars with battery assistance. Take out the gas motor all together and you get infinite miles per gallon, 'cause you don't use any galllons.


Tim F

[Dave Dunn]

I have to agree with Tim. If the estimate of fuel economy is not based solely on the gasoline you put into the car, the comparison to others is invalid as the energy has to be produced and paid for in another fashion. Cost per mile would be more appropriate since that would necessarily include cost of battery charges off your home power grid.

250 mpg..that's like comparing apples to battery powered oranges.

[Tim Folkerts]

To be fair, I will say that I found the website of the developers of this car, and they were much more accurate about the energy use and cost of operations on their site. They appear to be pretty knowledgeable engineers who really are hoping to make a better car. They even considered the costs of amortizing the expenses.

It was the reporting that picked a few bits out of context and distorted the effectiveness of the battery assist.


Tim F

[Jim Wynne]

Originally Posted by Tim Folkerts

To be fair, I will say that I found the website of the developers of this car, and they were much more accurate about the energy use and cost of operations on their site. They appear to be pretty knowledgeable engineers who really are hoping to make a better car. They even considered the costs of amortizing the expenses.

It was the reporting that picked a few bits out of context and distorted the effectiveness of the battery assist.


Tim F

Journalists who write about science and engineering are often woefully ignorant when it comes to science and engineering. It's always best to find and read the source material whenever possible.

[db]

Okay, Tim, so let me see if I got this straight. I may save a bunch of money on gasoline, however, my electric bill will increase (no net gain?). Of course, if everyone follows suit, then the law of supply and demand will result in electricity prices increasing and gasoline prices decreasing. This will cause folks to jump from electric, back to gas and the see-saw ride begins.