the sweet spot...
Posting Guru
Joined: Sep 2009
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From: Virginia beach, VA
To answer the OP I find that I get the best mileage staying around 2000 rpm and under 10 lbs boost while accelerating.
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Freshman User
Joined: Feb 2011
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I've noticed I get my best mileage right under 2000 rpm, which is right at 70 mph for me. If I go above 2000 rpm, the mileage starts to go down. Of course, that's with the stock tuning. I'll be doing a road trip in a couple weeks and I'm curious if the new tune will change the sweet spot or if it's more a matter of aerodynamics than torque/hp.
Posting Guru
Joined: May 2003
Posts: 1,990
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From: Middleburg, FL
Posting my results after my recent trip. Trip was 430 miles each way and almost entirely on Interstates. I'm running Matt's SRL tune. I didn't notice a significant change in the "sweet spot." I kept it at 71/72 mph which translated to around 1925 rpm. If I went faster the mpg as indicated by the computer would start to decay (tenths). I averaged 18.6/18.7 mpg both ways. This was about 1.5 mpg better than I got on the same trip the same time last year doing the same speed with stock tuning. So I'm happy. IMO, it doesn't appear the tune changed the "sweet spot" for my set-up. However, it's only one data point.
Post Fiend
Joined: Oct 2002
Posts: 11,314
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Not that I ever pay attention to the mpg on my large shoebox, but hasn't it been noted that tuning changes the calculation accuracy of the overhead or better known as the lie-o-meter 
?
(if that was what you were using )
?(if that was what you were using )
Fleet Mechanic
Joined: Jan 2007
Posts: 1,708
Likes: 7
From: Circle City
My trucks "sweet spot" is the drivers seat. 
It's a blast to drive and the capability to tow with it across country.
I drive by the "seat of the pants" feel. I listen to the engine. I don't look at the tach as much as the speedo however my truck seems to cruise empty in the neighborhood of 72 mph. If I am dragging 7 to 12 thousand pounds worth of trailer then I have to use the button, then the so called "sweet spot" or power band is indicative of the terrain but it still limits my travels to roughly 60 mph. My main focus is the EGT gauge then pan to read the other temps, primarily if it's really hot outside and the hills are steep and long. Nice transmission, but it's all in the tunes.
It's a blast to drive and the capability to tow with it across country.
I drive by the "seat of the pants" feel. I listen to the engine. I don't look at the tach as much as the speedo however my truck seems to cruise empty in the neighborhood of 72 mph. If I am dragging 7 to 12 thousand pounds worth of trailer then I have to use the button, then the so called "sweet spot" or power band is indicative of the terrain but it still limits my travels to roughly 60 mph. My main focus is the EGT gauge then pan to read the other temps, primarily if it's really hot outside and the hills are steep and long. Nice transmission, but it's all in the tunes.
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