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I did my grille block at the same time that I was learning all the new hypermiling techniques.
While I certainly saw some significant gains during that time period (from 40mpg up to 48mpg) I can't attribute my gains to the grille block.
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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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