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Well, first off I wouldn't recommend blocking 90% of the grill. There are a few people running large and even 100% grill blocks (I am one of those), and for the average hypermiler its too much. I P&G like crazy and its even too much for me once I get up to highway speeds. So, make sure you watch to see how much your fan is coming on. I have an indicator light hooked up to the radiator fan relay so I can see how much its coming on.
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