The timing advance is computer controlled (instead of vacuum controlled like on older vehicles), but the initial timing is still set by moving the distributor. Remove the spout connector in the wiring harness near the distributor, hook up your timing gun and set it to 8 or 10 degrees advanced, shut it off and replace the connector. It will be interesting to see what effect that has on your mpg since you will have instant feedback. I know you can feel the difference in a stick car, with that automatic it might not be too noticeable to you, but I bet the MPGuino will notice it.
Oh, and underdrive pulleys should be dirt cheap used for that car too.
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"Don't look for one place to lose 100 pounds, look for 1600 places to lose an ounce." - Tony DeFeo
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