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One other thing to try is to make sure you are putting gasoline in it, not 10% ethanol, most people I talk to only see a 15% or so drop in their mileage with ethanol in the gasoline but I've talked to some people who see a much greater drop.
When you changed the spark plugs, how did they look? where they all colored the same on the tip? if you are driving short trips like it sounds like and never hauling a load you might try the next hotter plug.
It might also be time for new transmission fluid, after 15 years and fluids start to cook down and get thicker.
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