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Looking at the Dodge website i see no mention of different HP outputs on the Hemi's. They all show as 395HP. These trucks have plenty of power. My 11' puts out 390HP and it's like driving a car when it comes to merging on the highway and passing. I have no complaints at all. Other then fuel economy of course. These trucks will get at best mid teens even on the highway.
The only way your going to get mid teens for hwy mpg. IS if you buy this guys 2011. You need to take advice from someone that has the truck your TALKING about. The 13 and 14 with a 8 speed is so much better then the older trucks. I get 2l on the hwy at 70 +.I average 17. Unless your getting the basic truck you should get the 8 speed.