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PoPo5.0: Gear ratio directly affects rated towing capacity. Hence why the F450 doesn't come with the lower gear ratio options. A truck with 3.55 would get better MPG on the highway while NOT towing, but the 3.73's might do better with a trailer in tow as the engine is not struggling as much. With these trucks MPG is more about the way you drive it than gear ratios.
On my truck, and I think most 6.4's, the sweet spot for the best MPG is just below 2000 rpm. So a truck with 3.55's would probably get the same mileage as a truck with 3.73's if the RPM's were the same on a given trial. As for going up in tire sizes, I'd think 3.73's would be ideal if you were to go with a 37" tire.
Lots of people on here have lots to say about this subject. But remember, math is math, and there's benefits to both ratios.
2011 F350 Lariat SRW Crew Cab Long Bed 4x4 6.7 H&S Mini Maxx DPF Delete EGR Delete running 265/70/19.5's
Chevy comercials are like OBAMA, ALL B.S. over promise and under deliver
This stuff isn't as simple as tuning your TiVo to record your Jerry Springer re-runs while your out cruising Wal-mart parking lot for transexual hookers.