Think I'm in trouble with the wifey....

[aloneranger223]

Let me first say that I've been on this forum for about 4 months now and the amount knowledge and the willingness share has been awesome. In 11 years of being on auto forums, I think this is the best one yet as far as member's go.

This weekend I took step two in "bullet proofing" my 6.0. (Step one was to go fully synthetic.) I installed an EDGE CTS/w EGT probe, Sinister Coolant Filter, Custom SCT X3 tunes, and for a little more performance/milage/fun - 4 inch catless/mufferless exhaust from MBRP. So it was quite the productive weekend.

Now my problem..... My justification to the wife for letting me spend all of this money was that it would improve the mileage on the truck. Well, after putting about 200 miles on the truck this weekend, I'm not getting any better fuel mileage. I've been careful to keep my foot out of it, but still no luck. I tried the economy tune and street tune. Those of you with similar mods, did you notice any improvement?

[2006PSDSD]

I have ever heard of any mpg gains that were subsantiated, except from Dave, and the work he had done by Power Hungry (FICM tune and ECM rollback). I'm trying to get in touch with them now to have the same mods done to my truck . I don't know if it depends on the truck or the person telling the story, but mpg gains are somewhat of a unicorn type thing IMHO. I've been here for along time, and heard a lot of different ways to gain mpg, but none that sounded like they'd work (and no other claims by other members). Bad math, maybe

[Evil Eye]

Just keep using that line... It doesn't really work on my wife anymore, but I keep buying more stuff for my truck!

[Goose350]

I went from 13-14mpg in the city to 15-16 when I put my SCT on. Went from 15-16 on the hwy to 17-18.

This was with an extreme tune and driving it like a race tune

[ToMang07]

Or you could just show her the cost of the mods, then the cost of a replacement engine.

[aloneranger223]

Originally Posted by Evil Eye

Just keep using that line... It doesn't really work on my wife anymore, but I keep buying more stuff for my truck!

HAHAHA!!! Well, she did go spend $200 on clothes last night, so that half of the tunes...... When i put the tires on there, the mileage dropped from about 16 in city driving to around 14 and from 22 hwy to about 18. It's her daily driver, so I might have to change the tires back out. The last Razorback football game we went to (215 miles there) before the tires I got 21.5. When we went after the tires I got 16. That stung a bit.

[2006PSDSD]

Are you adjusting the mileage for the bigger tires? Mathematically

[aloneranger223]

Yeah, but it doesn't seem like it's that big of a difference. According to 1010tires.com, the difference in the stock size and my current size is 3.57%. At 16 mpg, thats only .58 mpg.

[TampaSteve]

Have you adjusted the tire size on the SCT and run your hottest tune and drive it like a truck. Then calculate your mpg by hand not the idiot gauge. See if any improvement, but don't expect much....Good Luck

[2006PSDSD]

It was worth a shot