What are you seeing for mileage now with the 35's??
Summer diesel - city 13-14 hwy 15-16
Winter diesel - city 12-13 hwy 14-15
Granded this isn't apples to apples but I went from 3.73's to 4.30's in my '06 6.0L with 35's and lost .5 mpg
so hopefully my outcome will be the same if not better.
2011 F350 CC SB SRW LARIAT....SOLD!!