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Following up on advancing the pump, here's a rear wheel dyno chart showing the effects of advancing the pump. Advancing the pump .040" pretty much exactly equals 3 degress, and this is safe for the engine. It is a free mod, and 6HP and 15 ft lb at the rear wheels is very noticeable. I've done...

No not really, but the timing chain can stretch over time. That usually isn't a sudden thing though. These engines almost always perform better and get a little better mileage with the pump advanced about about .040" or 1mm. 13mpg sounds low to me, but it doesn't get cold enough here to have to...