Items found at the scene included a petrol can, a pile of burnt clothes and a note.
Forensic scientists told the inquest it appeared Mrs Philpotts died in a flash fire after her badly burned body was found near a petrol can.
She said Mr Philpott told her he believed his neighbour was responsible for the fire because he had borrowed a strimmer and petrol can but not returned it.
In America, where the price of a gallon of petrol can be less than the price of a gallon of bottled water, large fuel-guzzling trucks and sport utility vehicles (urban assault vehicles) make up more than half of the market.
They are called flexi-fuel vehicles, because as well as petrol they can run on bioethanol.
Ethanol, which is used mainly as an additive to petrol, is not a particularly good fuel: it offers only about two-thirds as much energy as petrol and can corrode pipelines and car engines.
"All we're trying to demonstrate is that here in the UK we can make petrol from air, " he said.
Iraqis can buy petrol at a mere 1.3 American cents per litre.
At the hearing, Mr Webb said he had a can of petrol and firelighters in the vehicle but denied starting a fire accidentally or on purpose.
The selling point of the E-rev is that is cuts out "range anxiety" because if the electric charge in the battery runs low the car can use petrol to generate more.
If he can make voters smile by freezing prices on things like bread and petrol, he reckons, he can call an election sooner than that with a decent chance of winning.
If a car runs low on fuel during a drive, a user can pay for petrol using a company credit card that is supplied with each car.
On its website, petrol company Shell said prices can vary from region to region due to "factors such as distance from the refinery or distribution terminal to the petrol station and the number of customers in the region".
And although the trial will help to work out the best way to deliver the fuel cell's hydrogen, and how to build a suitable distribution network, it will not necessarily bring the price down to the point where fuel cells can compete with petrol or diesel.
Renault is particularly keen to promote fast-charging stations, along with exchange centres on motorways where depleted batteries can be quickly swapped for another one during long journeys. (This approach is being championed by Better Place, a start-up which has developed robots to handle the battery-swapping process.) Meanwhile the tinkerers are already at work: some are planning to build small, petrol-powered generators which can be towed behind battery-only cars on long trips.
"Many families can't pay their mortgage, their rent, get their groceries, buy food, or put petrol in their car and older people can't get access to their pensions, " he said.
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"Duty escalators sound harmless but in practice they can mean more expensive petrol and more expensive beer, " said Mr Graham.
As with many other energy production and storage methods, only time and market forces will determine how far the petrol-from-air idea can go.
And with a petrol consumption of 67mpg, few cars can match its fuel-efficiency.
At best, the motor industry expects only a 15-20% further improvement can be squeezed from existing petrol engines and their transmissions.
Still, if politics or technology rules out congestion-based road-pricing, a second-best case can be made for raising the petrol tax instead.
Between them, General Motors, Ford and Chrysler now offer over three dozen models that can run on E85 as well as petrol.
With the Ampera he can drive 50 miles and then switch to petrol.
Most Brazilian cars can run on a mixture of ethanol and petrol, thanks in part to the flex-fuel engine, developed in the country.
It is doubtful whether Iran's leaders can achieve all their stated aims of maintaining petrol production, manufacturing lots of petrochemicals and cleaning the foul air their citizens must breathe.
Nowadays, he says, he can never get to a crash because there is no petrol for his car.
You seemingly can't glance up from the road without being bombarded with signs advertising petrol prices and headlines noting bumper profits for the oil firms.
The result, if all goes well, will be a mixture of hydrocarbons that can be fed into the stage of the oil-refining process just before petrol and diesel emerge from the stills, and at a price that competes with the equivalent chemical mixture produced by traditional methods.
The pots can be for "food, entertainment, holidays, stationery, car maintenance, petrol, white goods", among other things, explains his wife Diana, a teacher.
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