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Message: [QUOTE="TARM, post: 77482, member: 578"] If you really want maximum mpg then I would go with something like a GT4294 1.15 Get a journal bearing one off a rig in the junk yard and pick up a rebuild kit and you will be out of it all for only a few hundred. You can 200% you are wanting to. I HIGHLY recommended Nate@ Unlimited!!! Go with a kit from Jake unless you weld and are doing it yourself or can find one used. If you want to get it done to save money down the road get the wastegated version of the kit. The turbo lites plenty fast with the 1.15 housing and will let you tow all you want. What that turbo combo is gonna get you along with the injector is very low boost at cruising RPM and very low EGT that means very low drive pressure against you and efficient burn. Also with the power they are gonna have you tuned to you will not be close to overdrving the turbo at all but not be under it either. The turbo itself is going to be more efficient and for any given boost psi the charge will be cooler than smaller turbos or stock. IMO if you want the very best get it live tuned. I think Bill or Matt is an awesome choice for tuners. I run Matts but would run Bills if Matt was not tuning. Get lived tune. Did I mention get live tuned. In case I forget later GET LIVE TUNED!!! Then when you are ready to crank things up you can drop in a forged motor which are a dime a dozen in most salvage yards. Send your injectors out to be refreshed and have some fast mods done to get all you can out of the top end now as well. Add or start using that wastegate and get a good controller for it. Have it live tuned again and reserve some time on a load dyno during it. Still keep that mpg tune you already have as you can still run it with maybe a slight tweak. You then can take you 350HP original MPG tune and with the turn of a knob it will be a fire breathing ass kicking to a 575-600 HP truck. That will have you sliding all over the rode 4x4 or not be damned. [/QUOTE]