Jack - the speed I tow at doesn't appear to be a factor in my MPG. I've towed it at 65-70max and at 55-60 and it appears to be the same either way. My dad has a 1500 GMC with a 5.3L and is getting 2-3mpg better when hauling this trailer in the same conditions. I have made minor performance mods (Headers, exhaust & Programmer) in an effort to increase the performance of my truck and it seems that it has hurt more than helped which is why it is frustrating to me. The truck has all kinds of Power on the Low End it's just at the Top End where is seems to be lacking the Power. I called Bill a couple of weeks ago and he said that it's possible that the tune may have had an issue with the programming so he is going to rewrite it and see if is any better. I hope it was just a programming issue because i can't afford <7mpg on a 1000mile round-trip haul.
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