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I had read in a few computer tuning articles that retarded on the highway would net the most mpg. I have also heard that advanced would net the most.
I tested this on my suburban using Jet DST. I pulled four degrees out accross the board and let the computer relearn it's new tuning. I went on a trip with cruise set and mile markers for starting and stopping the test. My scangauge read 18.*mpg I then bumped the timing up eight degrees, four to return it to stock and four more beyond that. Relearn and drive the same stretch of road less than an hour after the first test. The result was 22.* mpg. All tests were with cruise on and running 55mph. I also made another run with autotap running and no knock was detected. I still have more room to go up. 89 octane was used.
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