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Originally Posted by devilsfan
I easily got 15 while stock. It's not uncommon.
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MAYBE an 08/09 truck, with stock tires, and a very light foot on the pedal.
Stock my 04 was right in the 12.5 or so range, on a mostly highway trip I could get around 14.5 +/- assuming there was no wind.
With 37's and a Hypertech Max Energy I'm at 10.8, that's about 30% highway, 70% city. Without the tuner, and on 37's I was in the high 8.something low 9 range. Although, within the last couple of months I've turned off the DIC all together and just drive the thing, there's no point in obsessing about it.
There was a time, a couple of smart phones ago, that I had a photo of something like 26 mpg (instant) at 75 mph! ... of course that was in about a 30 MPH tail wind and down hill!