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I have an 80% grill block, Home Depot Lawn edging air dam, piece of coroplast acting as a partial engine bay belly pan. I've also removed all the air intake tubing prior to the air filter box. So the air filter box is just sucking air from 6 inches or so behind the radiator. With this I run air intake temps about 20 warmer then the outside air after engine warms up. When my cooling fan cuts on I can see 30-40 degrees warmer (100-110). When I get above 110 I do start to ping when I have a throttle position greater then 25 or so. I have gotten my best trip mileage when it's warm like this -- Don't know if it is HAI or I'm getting better at hypermilling. Just my experience (No experimental data)
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