MackFarmer05 Posted December 22, 2015 Share Posted December 22, 2015 I've owned this truck for a few years now and still have not been able to get satisfaction out of my dealership which I did not buy from, private sale. Although I have had numerous issues the mileage is the last major still to solve. The truth k has had a few 3 fuel pumps replaced, new turbo, intercooler, the ECM tuned to 500hp and EGR delete with blocker plate. Under full load boost will hit 40psi@1200rpm dropping to ~30psi@2000rpm. It has anever Eaton 9 speed with 4.11 gears and runs 1650rpm@65mph. I can only squeeze 4.9mpg out of it even while averaging 50mph. I'm lost and dealership is no help at all. Quote Link to comment https://www.bigmacktrucks.com/topic/43199-03-cx613-427-mileage-and-boost/ Share on other sites More sharing options...
dogg rescue Posted December 22, 2015 Share Posted December 22, 2015 Averaging 50 mph? I'm guessing you are doing some stoping and starting? You only get better than that when you are going in a straight line for many miles at a time. Quote Link to comment https://www.bigmacktrucks.com/topic/43199-03-cx613-427-mileage-and-boost/#findComment-316781 Share on other sites More sharing options...
MackFarmer05 Posted December 22, 2015 Author Share Posted December 22, 2015 I average +50mph on a tank. I travel interstate 65mph idle while loading and unloading. I have a 93 Ch613 with 350 running the same trips and it never gets worse than 5.5mpg even with lower average tank speeds. Also the EGTs have never gotten higher than 800 on the CX. Quote Link to comment https://www.bigmacktrucks.com/topic/43199-03-cx613-427-mileage-and-boost/#findComment-316813 Share on other sites More sharing options...
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