One is the electric car, the other is the fuel cell, or the hydrogen car.
Finally, the fastest 10 cars will shoot it out for the top 10 places for the final 20 minutes - but with the amount of fuel with which they will start the race, with fuel being put back into the car after qualifying according to a pre-arranged formula.
Most of Toyota's energy is instead being funneled into its tried-and-true hybrids, with 21 due on the market by 2015, as well as plans to deliver the company's first hydrogen fuel cell car by the same year.
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Stedman, a chemistry professor at the University of Denver, said there are several problems with the alcohol fuel, one being that it messed up the fuel pump in a car he uses.
Thanks to the efficient turbocharged, common-rail, direct fuel-injection diesel engine, the concept car is still very fuel-efficient.
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In fact, Henry Ford's Model T a hundred years ago got 25 miles to the gallon, which is better fuel economy than the average new car today.
Massa's botched pitstop at the Singapore Grand Prix a fortnight ago, which saw him drive down the pitlane with the fuel hose still attached to his car, was the latest in a long line of errors.
They go on foot to save fuel and only take the car when the situation requires it.
To illustrate one of the key issues in simple terms, imagine that you have to extract the ethanol from Bud Lite as the fuel for your car.
Johnson would like to see a single CAFE standard rather than two separate ones, as cars overseas are more fuel efficient and then the car companies could count their good miles per gallon European cars with their gas guzzling American trucks.
To the frustration of the German car companies, diesel fuel nowadays is often more expensive in the United States than gasoline.
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Other incremental improvements range from solar panels that run the air conditioning during stand-still, so fuel is not used to cool down the car, to small electric motors tucked away in the doors and powered by batteries that are charged when a car is braking.
And if you look at how people are acting in the marketplace, people are taking account of the fuel economy of a car when they buy one.
The company car fuel benefit charge threshold is changing slightly.
Incentive backed challenges attract "maverick thinkers who challenge normal assumptions" and make heroes of the teams who compete in these paradigm-changing efforts to solve significant social problems like building the ultimate fuel-efficient car or developing a lunar landing vehicle.
Mahindra is introducing the car at a time when high fuel prices is one of the key reasons for denting demand for cars in India.
There are several smartphone apps and online resources (including those from the AAA) that can help drivers plan the most fuel-efficient efficient routes for errands and car trips and locate the cheapest gas prices while en route.
Thus the electric car is harvesting in terms of well-to-wheel miles only about 27% of the original fossil fuel energy, so not that much better than the standard car running on petrol or diesel.
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Thus far the star of this new science has been ethanol, a car fuel made from corn, but around the world chemical, grain and biotech companies are working to produce auto paint, cosmetics, even apparel fiber from renewable resources.
For years, it has raced ahead of the Premier Padmini, a roomier but relatively unwieldy and less fuel-efficient car modeled on a 1951 Fiat, and the Fiat Uno, which sold only 8, 500 units in the past year.
Consumers should see an increase in fuel savings (over the lifetime of their cars) as newer and more fuel-efficient cars become available starting with the 2017 car models.
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But Jeep needs to win back the suburbanites who have spent the last decade defecting to a newer batch of car-like, fuel-efficient competitors like the Chevrolet Equinox and Toyota RAV4.
Taking a lead from the utility market, where OPower uses data from utilities to let consumers know how their energy use stacks up against comparable households, the car companies could let customers know how their fuel efficiency compares with other owners of the same type of vehicle, then suggest ways to improve.
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Apart from developing more fuel efficient engines, the mileage of a car can be boosted by reducing the car weight.
And the water is a potentially lethal stew of fuel, broken glass, jagged car parts, and concrete and rebar from the fallen bridge.
The extra weight could also rob the car of its full fuel load, forcing it to make extra pits stops during a race.
Even as the average car's fuel efficiency has risen 58% since then, U.S. oil consumption has risen 19% to 19.5 million barrels a day.
When the battery is depleted (or when driven at very high speeds), the premium-gas internal combustion engine powers the car, but its fuel mileage suffers from having to shove around 400lbs of batteries.
In testing for six months and launching formally on Oct. 10, MyBizHomepage.com aims to give busy entrepreneurs like Lapides an easy-to-grasp financial snapshot, rendered in bite-sized charts and graphs that are as immediately intuitive as, say, the speed and fuel dials on a car.
The CR test car got about 30 mpg on premium fuel, and about 27 mpg on high-test when the engine was running.
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