That's pretty good. Whatever you do... DO NOT get an economy tune. It's a waste of money IMO. You will get better mileage on the higher horsepower programs, IF you can drive responsibly with it (very hard to do). The economy is about the same power as stock, it just uses a little more timing for a touch extra power, but the fuel just isn't there. I found myself flat footing the truck trying to get out of it's own way with that tune and got less mileage than with my X-treme street tune driving like an idiot.

 

I dont think hed be gettin much worse. You have to remember that the truck is actually driving more miles then the computer thinks due to the bigger tires.

 

That is true, I keep forgetting that. So a little BETTER than 11... maybe. I still laugh to myself when I hear guys saying they get 22 in their 6.0. Not in this lifetime and if they are, they better hold on to that truck forever.

 

Someone was tellin me the early 6slows like the 03s were getting over 20 ive never seen it in my truck but ive seen 19 on many good days mostly around 18 couldnt be happier just wish i didnt have so many EGR problems the only reason I dont delete is the extended warranty they dont know I have it tuned and never said anything bout cold air and exhaust?? But They told me EGR Delete would wave bey bey to Warranty WICH SUCKS I want EGR gone thats about the only problems I have with my 6.0L anymore

 

It's a tough choice. Having the EGR cooler on there will only accelerate further issues... It seems as long as it's there, it will fail eventually. You would think they would be happy to have it gone, it'd be less work for them.

The 03 trucks did get better mileage when they first came out, but they were thought to kill FICM's and eventually injectors with the strategies they were running, that's why Ford introduced all those new strategies to get reflashed. Mileage dropped severely with most of the newer flashes.

 

HOLY CRAP! I thought I was the only 6-Oh owner that wasn't afraid to admit that he got azz for milege!

I went from 14~15 to 12~13 in town when I put on those 35s. Although those same 35s have put me up to 18.5 at 70 (corrected), unloaded on the highway.

I'm no math wizard, but I did figure out how to hand calculate my mileage for my tire size with some help from an off road web site and an Embry-Riddle math instructor.

 

Anything over 17 I honestly find hard to believe. Especially with the newer flashes from Ford. 35's shouldn't be a huge difference since some of the trucks came with tires almost that large from the factory. I believe some of the tire options on the 20" wheels came out to something like 34.2" We avgd 14.5 in my buddies crewcab going from NY to NC with a 6" lift and 35's (He had new 37's waiting in the garage and didn't want to do the long trip on the new rubber). Not too shabby. The faster we went and the harder the truck got drove, the better the mileage became for some reason though...

I seem to get around 15 no matter what, driving slow, driving hard and fast, towing... doesn't seem to matter. I've run synthetics, non synthetics, additives (hoping the rev-x will work now!) and still it's 15.

When I first got my programmer I did a comparison that you guys will find humorous. I loaded up my economy tune from Eric @ Innovative and filled the tank (I fill up to the top of the filler neck for the most accurate mileage testing). I drove the truck for the entire tankful UNDER 2000 rpms and UNDER 10psi (according to the factory boost gauge). That was the hardest thing I've ever had to do . I avg'd a whopping 15.1mpg. I then loaded my x-treme street up also from Eric @ Innovative, then filled the tank again, I drove this entire tank like a maniac. Mind you both fill ups did have a fair amount of highway driving, and both I did 70mph for cruise, however my in-town driving and accelerating habits were drastically different between the two. I checked my mileage at the end of that tank and netted 15.3mpg. Guess what happened then? I removed my economy tune from my SCT and never used it once again. I asked Eric about this after and he said that sounded right, and that the economy tune is better for putting in the truck if you have to let a buddy drive it.

Xtreme tunes all the way!

 

Over torqued the adapter to the fuel bowl! Time to figure out how that comes off.....

 

Same here. I usually avg mid 15s no matter what. I just switched mine to amsoil from reg rotella and had the guy where I bought it telling me about how they always pick up a few mpgs when they switch. I already didn't believe him since I didn't notice a difference in the cummins when I switched it to synthetic. Neither truck has gained any mpg from synthetic. I recently tried the Ford fuel additive in the 6.0 and the first tank was in the 17s but after two more tanks I'm right back in the mid 15s while still using it. I'm happy with the mid 15s because its better than any gas truck I have had but I will always try to get more out of it. I just never expect to. I am going to order one of these springs and try it out. Its cheap enough I won't be disappointed if nothing happens.

 

Since this was such a pain for me to find, here's the p/n for the secondary fuel filter/oil filter housing: 3C3Z-9C166-AA. Your freindly neighborhood Ford Service Rep should be able to find the recommended gaskets as well.

In stead of tearing into the part, I tried looking up the instructions (the IPB wasn't all that great). Let's just say swapping the internal parts over is so easy, a caveman could do it!

I'll have it AND the gauge in tomorrow after work.