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Message: <blockquote data-quote="NightShade" data-source="post: 3084920" data-attributes="member: 29706"><p>Well I think that the upgrade is doing pretty good so far.  Was running 70 to 75mph most of the time the last couple days and put 775 miles on the truck.  Used 39 gallons so got about 19.5mpg when the truck was rated at 18mpg which is generally done at much lower speeds.  Still had a backseat full of stuff and a toolbox and some ramps plus gas cans in the back end so I am happy.  Usually don't do that well except for when I am heading to Peoria AZ from Albuquerque via Payson which is about 430 miles on a tank of 24 gallons or just under 18mpg.  I am very happy with how things are going and if I can get a heat exchanger made up and see what that does.</p></blockquote><p></p>