Well I guess during the refining process the following distill out in order depending on temperature: Starts with crude then diesel, then kerosene and then petrol. As for pollution - all are capable of polluting depending on how well (or otherwise) the engine burns them.
 S = k.I^2, where S is the amount of stupidity a species possesses, I is the intelligence the species has and k is the universal constant of stupidity.
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