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Just made a 525 mile trip around 500 on "B" roads and 25 city. It was around 4 hours each way driving averaging around 65 mph in Georgia (read: hot). I did not have any overheating and averaged 24.4 mpg with a high of 28 when cruising on some of the 60 mph stretches (according to the DIC).

I don't know if I would have had better mileage with an air dam because I removed it almost immediately but as far as overheating, no issue.
 

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I wonder what the guys was doing for lifted trucks? I've seen most without the air dam. I have the zone combo lift and ground clearence is a LOT better than stock now but since I already lost 2mpg with the lift, I haven't bothered to remove mine yet.

Thought it's really tempting seeing the twins without the mini skirt !
 
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