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I have an F450 with 430 rear. Now has 22,900 miles on it. I'm very light on the throttle and usually cruise about 60mph. Average mileage: around town 12.8 mpg , mixed driving 14.5 mpg , traveling on the pennsy turnpike 16+ mpg.
A few things I've done to improve mileage include: installed a bed cover , aways use stanadyne performance additive, switched to full synthetic oil, and just today, updated engine software to TSB 08-13-2
By the way, when towing the 34ft trailer I run between 60 and 62mph. On a recent 3,000+ mile trip, I averaged 11.0 mpg. trailer weight is 9,800 to 10,000 lbs.
I'm anxious to see if the software makes any difference.
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