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Five Big Myths About Green Cars And Gas Mileage, Debunked Page 2

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In other words, maybe it'll happen in a few decades, but sun-powered cars with solar panels on them are nowhere near.

Charging an electric car from a large array of solar panels, of course, may be a different story.

(4) It's greener to keep your old car than to buy a new one.

Another myth. A study by M.A. Weiss et al., published in a 2000 report from the MIT Energy Laboratory, On the Road in 2020: A Lifecycle Analysis of New Automotive Technologies, calculated that fully 75 percent of a vehicle’s lifetime carbon emissions come from the fuel it burns, and another 19 percent was due to the extraction and refining of that fuel.

The raw materials making up the vehicle added another 4 percent, and just 2 percent of lifetime carbon was due to manufacturing and assembly.

In other words, you'll save a lot more energy if you junk your old car and buy a much more efficient new one.

Money, on the other hand ...

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2014 Volkswagen CC 4-door Sedan DSG Sport *Ltd Avail* Air Vents

2014 Volkswagen CC 4-door Sedan DSG Sport *Ltd Avail* Air Vents

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(5) Turning off your air conditioning and rolling down your windows saves gas.

Yes and no. Turning off the AC, by all means. And below 30 or 40 miles per hour, open windows are a better way to ventilate.

But the math changes at 40 mph and above, when more energy starts to be required to overcome wind resistance than to move the car's mass.

Modern cars have all spent thousands of hours in wind tunnels to make them as slippery as possible, minimizing aerodynamic drag--and all of that work is done with the windows closed.

At highway speeds, the energy required to overcome the addition turbulence created by open windows exceeds the energy used to run a modern air-conditioning compressor and a ventilation fan.

By all means, keep 'em open around town. But on highway, close your windows!

What are your favorite green-car myths?

Leave us your thoughts in the Comments below.

[hat tip: Burt G]

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