Then there's the broader question of whether the fuel switch should even take place.
In hindsight, her assurances and the guidance documents were the setup for a bait-and-fuel-switch.
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He says that if the problems of congestion are to be tackled, there will have to be a switch from fuel duties to congestion charging.
He has shown a strong interest in turning the island into a giant laboratory when the switch to fuel cell vehicles begins in earnest 10 to 15 years from now, as well as in testing the safety of hydrogen gas stations, the long-term reliability of cars and the economic viability of fuel cells.
Further, consumers will start to replace its aging fleet and switch to more fuel-efficient cars.
Other studies support total switch in electricity fuel of no more than 10% for a permanent, 50% decline in gas prices.
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Part of that growth, to be sure, was due to overall growth in demand, but a big part of it I suspect is due to the switch from less fuel-efficient and environmentally friendly unconventional vehicles, to more fuel-efficient and environmentally friendly passenger cars, trucks and buses.
Shares in power firm Drax have risen after the company said it had made rapid progress in its plans to switch to using biomass fuel.
Ministers know they need to switch the burden of tax from fuel to direct charges such as motorway tolls or urban congestion charging, but fear voters' reaction.
The switch to Sunoco Green E15, the official fuel of NASCAR and a renewable, low-carbon power source, reduced greenhouse gas emissions by 20% compared with unleaded gas.
It gets 48 miles per gallon and can switch at any time between using veggie oil or diesel for fuel.
Reforms to the duty - often referred to as road tax - follow concerns that increased fuel efficiency could lead to a fall in revenue from it as motorists switch to more environmentally-friendly cars which qualify for lower rates.
These systems must be smart enough to independently switch back and forth from solar when the sun is out to fuel at night or when there is heavy cloud cover.
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In September of last year, a massive explosion at a Pemex natural-gas plant near the northern border city of Reynosa killed 30 workers and caused critical shortages of the fuel, causing the state-run electricity company Comision Federal de Electricidad to switch to more expensive fuels in order to free up some natural gas for industry.
Evolution has arranged financing for methane-capture equipment in Argentina and for a switch by a 120-megawatt power plant in Hungary from coal to biomass fuel.
Increasing fuel-economy standards for cars and trucks will go part of the way, but for most of the switch America will have to rely on a greater use of alternative fuels.
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