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I did a simple cardboard grille block on a '97 dodge ram (which has a HUGE grille) and saw 2mpg, or about a 10% improvement. I did the same thing to my Chevette, which is shaped like a small brick and saw no improvement. So I think it depends on the vehicle. Grille blocks help some more than others.
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1989 Dodge Diesel 972rwhp, 27mpg.
1971 Nova tubbed, solid cam 355 w/nitrous, 8mpg (sorry).
1960 Nash DIY Hybrid Project
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