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Problem is, even with a ScanGauge it is pretty tough to accurately measure the effects of small changes in aerodynamics. It is hopeless when you are only testing tank to tank improvements. The grill block will help a bit, perhaps .4-.8 MPG, but that increase is almost within the noise of even the most carefully conducted ScanGauge testing. I did some testing on fender skirts on my Echo and was able, after several testing false starts, to determine that the improvement was .6-.8 MPG. Pretty small, but when one adds several improvements like grill blocks, fender skirts, smooth hub caps, underbelly, mirror removals, antenna removals, windshield wiper removals, etc. the total effects begin to add up. Most folks think that grill blocks are most effective at lowering warmup times, though there is a small aero improvement if well designed.
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