That hardly matters. It won't get approved anyway, no matter how clean the emissions.
Gasoline taxes are collected by the sales of gallons of gas. Reducing the number of gallons needed to be bought will directly impact the amount of fuel tax collected. It won't be allowed to happen.
One guy who owned a trucking company figured out a way to modify his fleet so that he got nearly double the mileage by adding alcohol to his fuel. He got slapped with an alcohol tax ten times higher than he would have paid in diesel fuel tax for his trouble.
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