Originally Posted by
KyChallengerR/T6spd
The automatic also has the MDS . Think that's right. Where it will drop back to 4 cylinder's above 60 mph cruising . A Chrysler engineer said the reason the 6 spd does not . Is because they couldn't compute what gear the trans would be in as with the computer controled automatic. So the 6 speed engine run's on 8 all the time . And that was the answer to that question in Hot Rodding by the Chrysler engeener . I have a 300C automatic that does run on the 4 sometime. I'm happy with my R/T running on 8 and get better gas mileage than my wife's car most of the time.
If it's only supposed to ingauge at 60 mines broke. Mine will ingauge at 20MPH if I'm just cruising down the street.