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Not sure if you're still out there JustLuckey, but I'll chime in.
I'm in a similar boat: I have a 2007 3/4-ton. I have the 6.7-liter rather than the 5.9-liter, but there's not a whole lot of difference. Mine is only 2wd and have a manual tranny (a big help). Your goals are reasonable: I've gotten 25.3 mpg on my last 3 tanks, and I've done 912 miles on a tank (I assume you have a 34 gal tank). I haven't done any aeromods yet, either.
I don't know if there's a difference between the 2005 & 2007, but removing the wipers is really easy on my truck. I can literally take them on/off in under 5 seconds. There's a little clip where they attach. You just flip back the clip and pull it right off. I take mike off and keep them in the truck. If it looks like rain, I pull out the driver's wiper and slap it on. I'm not sure how much it really helps, but I figure it can't hurt.
FYI, my OBC reads high as well (~2-4 mpg high). I use it to tell how well I'm doing, but don't trust the actual number.
You say you have a tuner, but a just running stock. Why? You can get quite a bit of mpg benefit by just running some good tunes. Also, you should be able to get a nice benefit from removing the EGR system, or at least turning it off with a tune.
I'm interested in you're electric fan install as well, let me know how it goes.
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