Compression Ignition Addict
Join Date: Feb 2009
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I'm not sure how you did your calculations, but here is what I've got for you:
400km = 248.55mi
90L = 23.78gal
248.55mi/23.78gal = 10.45 mpg
I would start simple and ditch the K&N filter for a Tymar 6637 and get rid of the Bullydog and go with either a TS chip with tunes from a reputable tuner (Beans, Tony Wildman, PHP, etc...) or a chip and tunes from DP Tuner. That should start you in the right direction.
Whatever you do, remember, you are driving a very large and heavy truck with 37" tires. You aren't going to get great numbers like 25mpg. I get about 13-16mpg around town and about 18-20 mpg on the highway with the truck in my signature. Good luck!
2016 F-350 CCSB FX4 Platinum 6.7L
2002 F-250 CCSB 4x4 XLT 7.3L (SOLD)