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Old 03-04-2013, 05:26 AM
S.C. Express S.C. Express is offline
Dodge Ram Forum Senior Member
Join Date: Jul 2012
Location: North Augusta S.C.
Age: 40
Posts: 1,017
Gender: Male
Vehicle: 2012 Ram Express
Trim Level: Express
Color: Silver
Engine: 2009-20?? 345ci (5.7L) Hemi V8 390hp 407lb/ft
Rep Power: 0
S.C. Express will become famous soon enough

At 67mph on a flat road, you should be getting around 19mpg or more with the MDS working properly. I'd take it to the dealer for a diagnostic check.
Sounds like you need a trip to the service dept. and let them check it out. Other people with similar issues have had a simple ecm update done to correct the issues.
Once it is corrected the MDS will work all the way up to about 75mph, any faster and the mds will not engage. I have gotten a solid 17mpg's running 85mph for 340 miles straight.
Jones MaxFlow 18" muffler swap, Green Performance drop in air filter..
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