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I think you need to tell us more, like
1) What does it mean 22-24mpg consistently LATELY? Does it get better mpg before?
2) What is the reading for your tire pressure? Most people says 30psi is inflated properly. Hypermiler would say at least the max psi (usually 44psi). Some drivers push to 50 to 60psi. (I don't recommend higher than that)
3) What is your tire model? Low Rolling Resistant tires saves more gas than performance tires.
Besides tires, did you clean up your trunk? Are you driving auto/manual? If you drive with auto, are you driving with D4? or D3?
Running AC with full setting hurts more than running with lowest fan level. Imagine you need to provide the same cool temperature with higher air flow, you need to do more work, right? Other thread also shows that affects mpg. Usually, open the window <40mph is more efficient than using AC. If you have to use AC, turn the fan slower.
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