I wouldn't base all of my view on fuel efficency on a single Road & Track article. Good rigorous testing is the only way to know for sure what will work and what won't.
So bust out the Scanguage and start testing, because that will be the only way to really make up your mind.
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"I got 350 heads on a 305 engine. I get 10 miles to the gallon. I ain't got no good intentions." - The Drive By Truckers.
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