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Just got back in after my first test drive of my Ram 2500 with the 5.7 and the new tune with a Flashpaq 3865.
Wow. I would never have expected such an improvement from just a tuner! I had to wait for Superchips to make a new tune for me because my truck had a brand new one from dealer they had not yet seen, but it was so worth the wait.

91 perf. tune and set the right tire size (33" from 30.5") produced a 5 mpg gain as per the truck's trip console for my normal driving!! I know that is not a TRUE 5 mpg increase, as the corrected tire size had to help, but I don't believe just the tire size made up the 5 mpg difference! Regardless, looking up and seeing a average of 17 - 18 mpg versus the 12 - 13 mpg I'm used to seeing sure as hell makes me feel better if nothing else. I'll have a better feeling on true gains after a tank or 2.
Even if there was NO MPG gains, the difference in the truck is truly amazing! No more crazy random gear changes, no more always feel like the truck is lugging, and bogging, and in general, feeling like the "SS Fat Bloated Pig" unless you have your foot in it and revving the thing. The drive ability improvement is night and day. Speaking of revving it, when you do, hang on...lol...I pulled out of my road and tramped on it, leaving 2 black marks about 30 - 35 ft long. I did the exact same thing once before....it produced a "shuddering" feeling for about 10 ft. haha!

I want 34" tires, but I was so worried about the performance hit, and lack of performance at 33" I was considering going to 4.56 gears (from 3.73), or even going back to the dinky stock size rubber. No worries running 34" now!

Best bang for the buck you will find for these trucks!

Great Feedback!!!

That is what I am talking about...

Have fun!!

Ron

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