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He is averaging about right and doing better than a lot of folks. There are a couple mpg threads you can check out. Your not going to gain anything through the exhaust.
Again, thank you to all that responded. Like I said in my original post. Every time this question is asked, it turns into a cat back discussion. (that means you Grandpa). Thank you to those that stayed on topic.
You can unhook the muffler without even removing it and the tailpipe from the hangers. I did this just to see what it sounded like. You can listen to as many as you want on YouTube, but it's just not like listening to it in person.
I also found this from the ask an engineer thread on here.