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Old 02-25-2012, 05:40 PM   #2 (permalink)
Frank Lee
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Join Date: Jan 2008
Location: up north
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Blue - '93 Ford Tempo
Last 3: 27.29 mpg (US)

F150 - '94 Ford F150 XLT 4x4
90 day: 18.5 mpg (US)

Sport Coupe - '92 Ford Tempo GL
Last 3: 69.62 mpg (US)

ShWing! - '82 honda gold wing Interstate
90 day: 33.65 mpg (US)

Moon Unit - '98 Mercury Sable LX Wagon
90 day: 21.24 mpg (US)
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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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