HPP had an article (Jan 2004) on the installation of Crane's adjustable vacuum advance, in which they picked up 1.5 mpg.
The article says engine modifications, and today's fuels, can cause the stock advance canister to not work optimally, or not at all, so you are not obtaining the optimal spark lead.
Summit sells Crane kit 99601-1. Its inexpensive and may make your car run better anyway, so its worth a try. I bought the kit, but have not put it on yet.
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