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Sounds damn good IMHO.
Fixed it so you don't have to skip.
I think in this case, the truck had been just sitting there, with people revving it up and idling it all day. I'm sure it will get better than 5.1 mpg real world.Holy crap, a full tank of fuel and only 228 miles to empty! I hope that's formulated from a lot of idling, racing and towing.
I just read in Motor Trend where their long term Power Wagon only got 8-9 mpg's and a little over 200 miles to a full tank.
Btw the exhaust does sound really good for stock.