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Hmmm, I wonder if I am having a similar problem on my matrix. At around 100k the mileage really dropped from the mid 30's to the mid 20's. Thought it was o2 sensors but the car wasn't throwing any codes. Took it to a mechanic and he couldn't find anything wrong with it. I kind of beat on my cars (ok, I beat on them). and the matrix definitely does not have the power that it used to have. I've got 120k on it right now. The MPG mystery is the number one reason I'm not going to go all out on efficiency mods for this car. Let me know what you find out!
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