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I had the regular G10 3 cyl in my 97 Metro. I did some experimentation and found I got the best mileage when using 93 octane and about 4 degrees advance, however, if I were you I'd take the advice of advancing it up to 6 or 8 degrees then backing off 1 degree at a time if you get pinging. Use a sharpie to make a line on the distributer and block so you can both judge the change and you can put it back if you need to. Make sure you set it while running whatever fuel you intend to keep running, and personally I made a chart of increments from 2 to 10 degrees and measured the effect of each on my mileage.
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