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I do not suggest anyone removing the cat, the O2 sensors drive the timing and the fuel/air mix. Besides, testing stations don't like it.
If your XC gets 26mpg on the highway, feel good about it. If you only take short cold engine trips, 18-20mpg would be great.
So, now all you can do is look for vacuum leaks around the intake manifold, the boost control solenoid (by air cleaner), and the fuel pressure regulator (passenger side sub frame under the firewall).
If you are running 87 octane, try a tank of 89 octane.
Next oil change, switch to 5W-30 for cold running engine.
Check the tire pressure. Check the rear brakes for drag.
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