RVA, I drove for about a month in Dynamic mode and for the past 2 weeks switched to Efficiency. I actually find I'm liking driving in Efficiency mode better. Seems like I am less disconnected from the road. I have been noticing that in Efficiency my mi/kwh seems to reach it's max values a little faster than when on efficiency...and actually maxs sometimes at 2.1. In Dynamic, it never got over 2.0. Maybe you have to do more hill/curve driving where all the stabilizing features kick in for Dynamic (but not for Efficiency) in order to get a measurable difference between the two modes. Regarding Efficiency, I'd like for the suspension to feel a little firmer than that setting gives me, but not sure what settings in an Individual profile would give me that. A caveat here: it has been just a little warmer here over the past two weeks, so the battery is a little happier.