In a world gone mad, gas prices are doing the unthinkable: Falling.

Gas prices are headed to a 12-month low, expected to fall below the national average of $3.28 a gallon, according to AAA. Prices spiked in April, hitting $3.94 a gallon, and resurged after Hurricane Sandy to around $3.87 a gallon.

One can only hope gas prices continue their downward trend in 2013, but one thing we've learned is that gas prices are unpredictable. However they go, here are five myths about gasoline, gas prices and American driving explained and debunked.

1. High gas taxes would be bad for the U.S.

We Americans love our cheap gas. The average price of a gallon of regular gas today is $3.32, according to AAA. That is higher last year, but still a lot lower than other parts of the world.

Gas prices in Europe trend closer to $6.50 per gallon. And before you talk about how the European economy is in a shambles, don't for a minute blame fuel prices. It has nothing to do with the problems of the European Union economy today.

Europe's per-capita energy use is half that of the U.S., owing to the fact that the high prices compel families and businesses to conserve the gas they use, and buy much more fuel efficient vehicles than we buy in the U.S. This policy leaves Europe much less vulnerable to oil price shocks, and makes Europeans far less interested in fighting Middle East wars.

U.S. drivers adapt when gas prices go higher. When gas prices near and top $4 per gallon, sales of smaller, more fuel efficient vehicles and hybrids go up. But then prices come down, sales of those vehicles soften and those of SUVs go up again.

Actual policy that set a floor for gas prices would change U.S. driving habits for good, give automakers the clarity of policy they need to build the right mix of vehicles and allow oil companies to plan their mix of investments.

2. Environmental regulations keep oil prices high

High, compared with what? Many politicians and pundits are fond of crying out "Drill, baby drill." Jobs and energy independence will follow. Would it surprise you to know that the U.S. for 2011 will be a net exporter of oil for the first time since 1949, according to the U.S. Energy Information Administration. That's right. The U.S. is now exporting more oil than it imports from the countries that don't like the U.S.

If the oil industry is being asked to agree to environmental regulations before they drill in new places, it is because regulators know that once oil companies start exploring and drilling in new areas, it is difficult and unfair to change the regulations once they have already started. Remember the BP oil spill in the Gulf? Oil companies make mistakes, and many times those mistakes stem from weak or ignore regulations about safety and procedures.

Oil prices are determined largely by the laws of supply and demand, and speculation, not regulations.

3. High octane gasoline improves mileage and improves "power"

Nope. Neither one. if your car is designed to run on 87 octane gasoline, high octane gasoline will not improve a vehicle's mileage. High octane gasoline does not make for quicker starting, nor does it increase power. If you notice quicker starting or more power after changing gas, it probably means your engine is in need of repair.

4. If I use regular gas in a car that says "use premium gas only," I will damage the engine

This is debatable depending on the engineer you speak to. But we are siding on this as a myth. Many automakers, especially luxury makes, prescribe premium fuel because the performance statistics they market to us (0-60 times and fuel economy) are based on tests using premium fuel. If you put regular gas in such a car, you may not achieve those exact 0-60 times, and you may lose a mile per gallon, but you will not damage the engine.

5. Diesel fuel is dirty

That used to be the case if you were comparing diesel to gasoline. But EPA emissions requirements have significantly tightened, and diesel engines now have to meet the same environmental criteria as gas engines. Automakers achieve this by adding a Diesel Particulate Filter (DPF), which removes visible smoke.

A few years ago, diesel fuel had to be made cleaner by removing sulphur. Today, the diesel we pump is Ultra-Low-Sulphur-Diesel, or "clean diesel." Today's automotive diesel engines actually emit less carbon dioxide than gasoline engines do.

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