Before you go ripping it apart to stare at the timing belt why don't you run a cylinder compression test? A very easy, cheap and accurate way of determining if the engine needs a rebuild. Low or uneven compression will rob you signifcantly of mpg.
My EGR valve passages were half restricted by carbon build up, could not even stick my pinky in the passage. I still saw 18.7mpg on a turbocharged motor.
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