Usually 13.5-14 under normal driving with a 6.2 and 91 octane. The best I have done is 18. Have to drive like a granny though, So only once. The winter driving puts me at 12-13.
Be sure to flush transmission and radiator. Change all gear box fluids. Change power steering fluid and brake fluid. Like the other guy said,plugs, wires and coils. You may want to redo the drivers seat. I priced complete cover and foam for about 600. Sounds like a fun project!
My throttle is a little slow out of the hole, when you nail it, it takes about a second to get full throttle. I am going to do some tweeking with the tune. As far as the rest of that stuff, sounds like you may have gotten a bad one. Mine is a 2012, I only have 10K on it and no other issues with...
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