Just an UPDATE: After having the Fast Intentions exhaust and HF cats installed for about 2 weeks, I have gained 1.5-2.0 MPG on my AVERAGE fuel economy! I am now at about 23.5 MPG average, whereas before I was at about 21.8.
My testing procedure was as follows: At the beginning of each work week I reset my average fuel economy and then drive to work/gym/supermarket/etc. as normal. At the end of the week (5 days), I simply record the average MPG. My commute to work and daily driving habits are very consistent during the work week.
During the first 2 weeks BEFORE the exhaust/HFC install I recorded just around 21.8 each week. For the 2 weeks AFTER the install, I recorded about 23.5 MPG average. Since the install was done on a Saturday, I was able to put a good 100 miles or so on my car so the ECU could "adapt" to the new modifications before I started the MPG test.
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