I also have the 2.4 6-speed auto and try this: Drive normally around 60 mph and note the RPM, mine is just a bit over 2K, then right-tap the gear shift so it goes into 6th gear - Notice the RPM jump up (at least mine does) which, to me, says that when in drive it is in like a 6 and a half gear (I know, not likely) but the jump in RPM does suggest a slightly higher gear is being used.
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2015 Compass Latitude 4x4
"The journey is the reward" (Steve Jobs 1983)
"Of all the paths you take in life, make sure a few of them are dirt" (anonymous)