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your getting pretty decent mpg right now....
I had a 66 mustang back in college) with a 200ci inline 6 cyl. I intalled headers and dual exhaust but used 1 3/4 pipe to provide some backpresure. going back and forth to shool on the freeway it worked great. When I graduated, I went to a single pipe and single muffler to get the backpresure up even more. I was doing mainly intown driving.
moral of the story is that you need some backpresure for the engine to work effecveintly....in my opinion.
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