I also have the airaid replacement filter and MIT. So far I've noticed similar performance to the airaid cold air intake w/out MIT in the city. The highway I'm not sure about. On a recent trip to AZ, I averaged 13 mpg going down, and 14 mpg coming up with a fully loaded vehicle. A couple of weeks ago, I went to seattle with the filter and MIT installed...was struggling to stay above 12 mpg there and back. I also have the hypertech III, which I didn't have going to AZ...
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