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The timing belt concerns me. It's quite possible the timing is off, causing the engine to run too rich. It would help us if we knew your MPG before, and then after. Do you remember specifically the first tank you noticed consumption going up? Who did the timing belt? Ask them to double check the timing on the car, because you noticed fuel consumption go way up after they did the work.
Go buy a tire pressure gauge from any major auto parts store or even Wal Mart. It's just like a bike tire. Unscrew the cap and check the pressure all around. Should be at least 30 PSI.
Do you have any dash lights on like the check engine light?
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