sessionslc Posted October 14, 2015 Share Posted October 14, 2015 I'm purchasing a Mack cxu613 Mp8/445Eaton 10spd w/3.36 rears22.5 low pro'sFull cab fairings, no side fairings72"? Full double bunk condo configurationScr w/dpf/def systemI will be hauling general freight 53" dry vanI run for fuel economy and I'd like any tips on how to get the best mpg out of this truck and setup.(Primarily what shift points and cruise speed this setup likes)Thanks in advance for any assistanceSent from my iPhone using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/42191-2012-mack-cxu613/ Share on other sites More sharing options...
wiserfrombud Posted October 17, 2015 Share Posted October 17, 2015 What are your lanes and how heavy is your freight? That truck is going to struggle with 80 000 on most any type of hilly terrain imo. If you run 45 000 gross across Texas, it should be a great spec. Quote Link to comment https://www.bigmacktrucks.com/topic/42191-2012-mack-cxu613/#findComment-307777 Share on other sites More sharing options...
Rockwell Posted October 23, 2015 Share Posted October 23, 2015 I have this identical truck, except my rears are 3:25. As WiserfromBud states, it does strain a bit pulling heavy going up grades, but it gets it done. Makes for great fuel economy on the flats, but you blow it all in on the grades lol. I would rather a taller set of rears, but hey, it is what it is.Very generally speaking, I shift at 1800 and it drops back to about 1200. Cruises at 65mph @ 1450rpm Quote Link to comment https://www.bigmacktrucks.com/topic/42191-2012-mack-cxu613/#findComment-308515 Share on other sites More sharing options...
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