So, I tried it out, and it seems like I gained 2 or 3 miles per gallon on the highway in my Accord. I haven't A-B-A tested it yet, but running at between 65 and 68 MPH on the highway left me with 33 MPG (I-95 from Georgia to Maryland). No other mods except an upper grill block and Scangauge. Generally, I make the drive with rear wheel skirts and a lower grill block and get 34 MPG (driving at 60-63 MPH). Acceleration also seems smoother, but I want to pull the plugs and do some kind of official testing first.
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