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And anyone who has read these threads knows I will come on and remind that an extra .000001 mpg (IF a muffler delete gives that) is not worth ruining the quality of life of everyone in the neighborhood for.
That said, especially if you have instrumentation, go ahead and do a proper a-b-a muffler-straight pipe-muffler or good muffler-fart can-good muffler test.
I had one Tempo with a very nice mandrel bent stock system and one where the muffler rusted off. I put a straight "test pipe" on there for a while and noticed no discernable difference in fe.
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