Thanks, everyone. Regarding gas mileage, I can't remember exactly what I was getting with the 2010 SRT, but it seems like it was around 17 combined city/hwy. So far, after 600 miles on the Hellcat, I'm getting 15.4. To be fair, the first 300 miles of break-in I went very easy. However, between 300-500, I manually shifted it to vary the rpms throughout the range, as suggested in the Owner's Manual break in procedure. So on balance, I think that is pretty representative of 600 miles of almost exclusively city driving.