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When hauling our 16K# 5er, we usually see about a 12* delta unless we're going up a long/steady incline but afterwards, it drops back. In fact, I see my deltas about the same (maybe 2 degrees higher) when comparing hauling/pulling versus not.
You'll get a lot of variation and a lot of opinions as to what is a good delta. For me, I have a 10* delta when unloaded and it's fine because I also have a CC, DRW, long bed with a 4.10 rear and I'm always hauling a loaded portable fuel tank so my gross weight is not the same as someone with a 250, short bed, SRW, etc. Both my coolers are new and I'm running ELC with a filter so I know they aren't plugged. So keep in mind that you need to compare somewhat apples to apples rig wise.
However that said, I think most everyone does agree that if you are running unloaded at 60-65 MPH on flat ground that your deltas should be less than 15* but when hauling/pulling, that doesn't apply.
2004 F350 6.0 - Traded 2/4/17 (Pity the fool who bought it)
2017 F350 DRW KR - Picking it up 3/25/17
Last edited by jd4010; 12-10-2012 at 12:36 PM.