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<p>[QUOTE=&quot;&#039;07 KW w/53&#039; Conestoga, post: 8405696, member: 171114&quot;]John, just an update for you.</p><p><br /></p><p>I ran over 1,100 mi once I got my truck back this week with the 3.42 rears...I cannot begin to describe the difference it made dropping the gear ratio down from 3.90!!!&nbsp; It is like a TOTALLY different truck!</p><p><br /></p><p>I now run at about 1,465 RPM at 70 MPH, not hitting 13th gear until I am already going about 60-65 MPH (depending how much I need to push it)!&nbsp; </p><p><br /></p><p>I can fly down a 2-lane IL state highway, with all it&#039;s little (and some big) hills, valleys and turns, at 60-65 MPH without effort, and the motor is QUIET!!!&nbsp; FINALLY!!!</p><p><br /></p><p>I don&#039;t know what I am getting for MPG but, I wanted to share this with you.</p><p><br /></p><p>FYI - when I picked UP the truck, I didn&#039;t have my GPS on, which I generally don&#039;t operate under &quot;personal conveyance&quot; miles.</p><p><br /></p><p>I got out on I-55 quickly, and was disappointed where the RPM&#039;s were based on what the speedometer was showing me...but, then I quickly recalled that it was always slightly slower than what we were REALLY going...however, no more than a few miles an hour at 70.&nbsp; This showed I was doing about 58 MPH at 1,500 RPM...BUT...I was keeping up with the 4-wheelers...so, I turned on the GPS...and, guess what, I was doing 72 MPH!!!&nbsp; </p><p><br /></p><p>That means, my odometer is off too...CRAP!&nbsp; It never really dawned on me before.</p><p><br /></p><p>I wanted to fuel up anyway so I could start a new trip on the odometer, so, I set the trip odometer on my GPS as well and checked both regularly!&nbsp; My dash is now off by a whopping 14.5%!!!&nbsp; </p><p><br /></p><p>My guess is, before the rear end change, I was probably off around 5-6%, which means, when I THOUGHT I was getting 5.5 MPG, I was probably getting closer to 6, which, while a 12.7 is capable of more, maybe it&#039;s just the way I drove it....or, the 3.90 rears running at 70 MPH!</p><p><br /></p><p>I haven&#039;t filled it back up yet....</p><p><br /></p><p>The interesting part though, before, I could NEVER run more than 850-950 miles on full tanks.&nbsp; I know this because I, not once, but TWICE ran it out of fuel!!!&nbsp; I know...first time I was pissed at the fuel gauge and likely bad depth on the pickups, the second time, well, I was just mad at myself!!!</p><p><br /></p><p>I will run a few tanks of fuel before I report back...this week I was pretty lightly loaded, but, more &quot;stop and go than interstate driving making a couple trips from Oregon IL to Ft. Wayne and back.&nbsp; I have a load of polystyrene foam right now that goes up to Madison Monday, then back to my usual.&nbsp; The gauges connected to my airbags telling me how much I weigh barely moved!&nbsp; I really don&#039;t like driving around so light, especially in the wind and rain last night!&nbsp; Oh well.</p><p><br /></p><p>Talk to you later!!![/QUOTE]</p><p><br /></p>

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