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Message: [QUOTE="INFRNL, post: 1564925, member: 9835"] If i was smart/ practical, I should have stayed stock-ish. Before I decided I wanted more power and to be faster, I had my truck dialed in perfectly. Power was good, zero turbo lag, no egt issues, 14-15 in town driving/ 17-18 hwy. I have an 03 CCLB dually 4x4 auto with 4:10's and was stock tires with this mileage. Then I went 250/100's with Pius LASB turbo (don't remember specs). mileage tanked, lots of lag. then I went 35's, no difference in fuel mileage. Or maybe I did it all at the same time. At some point I went back to stock tires/ ride height to see if it helped fuel mileage but didn't. Then I eventually went back to 35's. I only have a leveling kit on the front basically. I have 4" front brackets with 4.5-5" hanger IIRC and I think I went from stock 2" to 4" rear blocks....my front sits lower than the rear, I didn't want it level because of towing. anyway, then I went to SXE 369 with new tunes. no difference in fuel mileage but definitely a difference in overall power/ performance. I did check my order and tunes were for PMR's. I've tried an SXE 366 but it's basically the same as a 369, minimal difference but there is some as one might expect. I have learned how to keep lag to a minimum on take off. My in town sucks because I'm always under the turbo. tons of lag with either SXE turbo. That's why my GH tunes are currently the best because it doesn't go into OD/ lock up until around 50, so I'm not lugging or running below 1500rpm. All my other tunes, I have to drive with OD off or turn it off if I cone on a slight hill or want to change lanes/ pass someone. Obviously for this driving, 35's and 4:10 is not a good match. So my current thinking is to drop down to 200/30 injectors with an SXE 364.5/68. I also thought about going 160/30's with 363/68 but since i've been spoiled with the additional power, I think 200/30's would be a happy medium. They could essentially be tuned identically, but the 200's would allow for those times I want to be stupid or have fun. All of the above is empty driving. Luckily I only haul 7-8k 5-6 times a year when I have my slide-in camper and trailer with Polaris RZR 4 seater. Colorado Mountains going up above 10k' makes for an unpleasant drive, especially when you hit the switchbacks. I have a combination of improper gearing and injector/ turbo setup. I get stuck between gears. ones too high, other too low while I'm not getting any help from the turbo because it won't do much till close to 2k. Funny thing is when I ran the LASB and old PHP tunes, I never really had issues pulling a fully loaded 14k dump trailer around town. The LASB is probably smaller than a 366. anyway...enough of me rambling. stock or 160's is probably all a person needs. [/QUOTE]