H&S XRT PRO with DPF - Does it require CAI?

[HeadRush]

Hey,

Fighting the 6.4 for fuel milage. Had/have 7.3 and a 6.0, both responded exceptionally well to tuner programmers. Sadly the 6.4 hasn't. Had a BullyDog GT Tuner and saw ZERO milage gain. Went to local shops, they all said I have to ditch the DPF. Did that, purchased the H&S as BullyDog doesn't support DPF delete. Still, notta! Now I'm told I have to do a CAI. I'm nearly $2,000 into this and not a dollar saved in fuel! Before I invest more, whats your experiences with adding the CAI? Its a 2008 F350. No towing currently and run in no power & mild tunes from H&S. Its getting about 9 - 10 MPG (same as I was stock with no DPF delete or tune). Currently running smaller 17" skinny winter tires so rolling resistance minimal. I'm truly baffled, are the motors just that bad on fuel and do not respond to tuning? Frustrating the piss out of me for sure. I use truck everyday for work, tired of pulling into pumps every 200 miles UGH!

Thoughts?

Thanks in advance!

[WildStyle]

You will get the best fuel mileage out of the hottest tune as there is more injection timing. I run mine on stock tunes on hot (250) with the DPF/DOC removed with an H&S XRT Pro with the stock air intake and I am getting right about 15mpg in town. You pickup your most in fuel savings by not wasting fuel to complete a regen.

[INJEKTER1]

10-4, higher hp tunes will yield better mpg....i put $1700 into tuner cai, and exhaust and gained 20-25% in fuel savings...

[DSTRBD]

An air intake is not absolutely necessary, but it will definitely help out. I suggest taking a look at the S&B and AFE offerings.