As I performed several aero mods at the same time, I cannot quantify any fuel economy gains from this particular mod.
I can say that with four wheel covers, dual exterior mirror delete, a large amount of weight reduction, and a full grille block I had attained between 18 and 20mpg city in this 98 4x4 Blazer. This was up 20-30% from the 15mpg city the original owner attained over the course of 220,000 miles.
At present I am driving an 05 Honda Civic Hybrid, and unfortunately for the sake of the thread I no longer have any need for aero-modded wheels.
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Simplify, then add lightness.
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