I have an 08 F-350 supercab shortbed with 3.73 rear. Stock I averaged between 9-12mpg depending on re-gens I also have the 20" rims with the wrangler duratracs so I'm sure with 18" rims and some less aggressive all-terrain tires I could have gotten 1-2mpg better. Currently I have H&S mini-maxx tuner, straight piped, s&b intake, and a bed cover, grill cover for the winter (I heard this helps?). But my winter mpg is about 14-15 mpgcity driving only highway driving is towing a enclosed snowmobile trailer and I average about 14-15 mpg also. Last summer I averaged 16.4mpg hand calculated that was without the aftermarket intake. I'm hoping to average 17+ Mpg city now that I added the intake. I also run fuel conditioner in every tank summer and winter. I'm sure there is more I can do to better my mpg and I'm sure the more knowledgeable guys will chime in but overall I'm happy with my mpg but as always would not complain if it got better!
As you know, winter blend diesel doesn't help mileage so it will help when it warms up. From there, trying to remove weight or air restrictions may do a little along with the right tune, but I am out of ideas beyond that unless maybe doing 15% injectors (the jury is still out on that one and when I get mine in I will be running a new turbo so I won't be able to give apples to apples comparison). I honestly haven't ever worried about mileage either though. See my sig for mods, but my best to date (hand calced) was 19.7 on a trip with my wife to the beach. 1000 mile round trip with 200 miles in the moutains and the rest on the Interstate (at no elevation). That was running version .32 on the MM. It was an un-aggressive program for EBP (so the truck was more laggy and more smokey if you gave it 1/4 throttle or more) with fairly aggressive timing IIRC, but it did do pretty decent on mileage. I am sure if you worked with MCC or did a custom tune, you might get a little more (if you don't mind sacrificing some of the driving characteristics). I am guessing an early lock up on the TC helps....my truck is a stick so I have always seemed do a little better than most. With all the money I have put into reducing restrictions on air, it would never pay off from a mileage perspective (which aint why I did them).
Obviously, the trailers are different, but when I hot shot, I have to keep meticulous logs for my IFTA taxes. I was running canned H&S tunes until October, but I ended up gettting 10.16 MPG in first 3 quarters (that loaded and unloaded so grossing 15k lbs empty to 32,700 lbs) on a tandum dual GN and my last quarter was 10.32 MPG with 15k to 33,200 lbs with Matt's tunes. My weights averaged about 4k lbs more (I moved more heavier equipment) this last quarter, but of course, I never driving the same route so that has to be factored in. Still, it did seem like they did better and that was a tow tune which I specifically asked him to cut back on the timing to save some abuse to the engine so I do think that shows the difference in tuning.
2008 F350 ZF6
No Limits CAI and every air mod, MM w/ GH, DPF/CAT delete 5", Sean's 4" DP, SB DD 3850, Coolant Filter, Bushwacker flares, 2.5" Icon level, SD inserts tailgate/grill, PMF Tbars w/ 5" block, Elite EGR delete, Junior High Power Atmo, ARP studs, A-1000 (Marty's), Fuel Bowl Delete, 15% nozzles, Tial WG
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