Quote:
Originally Posted by sirnunya
3.08 gears are off the shelf, Yukon, Ford, etc., not custom...but I agree. CC/SB w/ no major MPG mods is definitely not going to get near 24mpg. TS chip is not aimed for highest MPG, Dave has a special MPG tune that he runs IIRC.
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This may be a new offering because about three years ago there were several of of us helping Dave look for a ring and pinion set that would fit his diff. Can't recall now what the hang up was but at that time there was nothing made for a direct replacement. IIRC it was Randy's that helped him work something out. With the price of diesel maybe somebody saw a need for 3:08's in the Superduties, sure would kill towing!!
Let me also say that if you are just filling up until the pumps shut off, this is probably the source of your innacuracy! Flow rate, air temp, and many other variables can affect when it actually shuts off. We always tell folks to fill it to the brim, to the point where you can actually see the fuel in the filler neck and it doesn't go down. This takes a few minutes at the pump, but it is the ONLY correct way to figure milage. Just filling up til the pump shuts off can easily be off by a couple gallons.
I am going to back out of this thread as I have seen where they go in the past. I wish y'all the best,
NCH