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Old 02-07-2013, 02:40 PM
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VulcanRam205 VulcanRam205 is offline
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Join Date: Feb 2013
Location: Lebanon, TN
Posts: 14
Gender: Male
Vehicle: 2011 Ram 1500 Laramie
Trim Level: Laramie
Color: Black with gold trim
Engine: 2009-20?? 345ci (5.7L) Hemi V8 390hp 407lb/ft
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Default MDS stays on with city driving, not highway

Hi everyone,

Just purchased a 2011 Crew Cab Laramie 2WD with 3.55 gear ratio. My MDS is staying on almost 100% of the time with city driving, but I'm still only getting 12.5-13mpg. It DOES NOT come on with interstate driving on flat roads. I'll set the cruise for 67mph and would expect the MDS to kick on as the engine is not stressed and shouldn't need 8 cylinders. As a result, I'm only seeing 17mpg on the highway at 67mpg....which in my opinion is unacceptable. I know it's a big engine truck, but my old 2005 Ram without MDS would get 17mpg on the highway.
Is this normal for it not to come on with interstate driving? Is there any kind of flash that can be done to correct this? I just kind of figured that the ideal time for it to come on was with flat driving on the interstate around 65mph.
Thoughts?
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