[Secret Agent Man]

All 2009 Hemi's do have MDS. Just because you don't have the indicator light, does not mean you don't have MDS. Not having the indicator light is just part of the price you pay for getting a first model year vehicle. Certain features were intended to be standard equipment, but were late to be released. Similar to the locking tailgate and backup camera, the MDS indicator light was added after the first few months of production.

If you don't have an indicator light and you're curious about when MDS is operational, a good rule of thumb to follow is that it is working when you are going downhill with the wind at your back. Otherwise chances are that you are in 8 cylinder mode.