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A missing muffler can improve your driving because you can hear the engine better and it gets really loud when you floor it so you tend to drive softer, back pressure is caused by blockage and poorly designed/over/under sized exhaust systems, proper sized exhaust uses scavenging to help pull exhaust out of the engine so removing it would be like removing your fly wheel to save weight, after all it is a big chunk of iron.
There are calculators out there for figuring out the ideal exhaust size if you do want to try to improve your mileage with whatever you install next, they use your engine displacement and speed that you want to run at.
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