2005 Civic Hybrid Fuel Mileage

I just recently moved from Colorado to Michigan and noticed a steep dropoff in fuel economy. I have gone from averaging 45-47 miles per gallon to about 36-38. I would have thought that coming down in altitude (from 5000 ft. to 600 ft.) would have made my fuel mileage better (more oxygen). Does anyone know why this could be happening?

Original post by mskibinski

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