Love my 2011 SRT. My mileage is low(14mph) but its all around town driving and is almost always spirited. Have not taken it on any long trips and only a few times on the hiway. The few times I did it cruised real well. You will find yourself going way over the speed limit and not even realize it.
Only gripe is I like the RT seats better than those in the SRT(wish Dodge would have had an option w/different seats, color, patter, style). I'm 6' 200lba and I swear these seats were made for a 12 yr old boy and these seats are WAY more roomy than my wife's 2010 Mustang.