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After air filter change 2004 Honda Pilot mileage reduced by 50%

After air filter change our 2004 Honda Pilot mileage was reduced by 50% (got about 11 mpg on interstate and we used to get 24 mpg). I checked tire pressure and they were low, so I inflated them. I have a code reader, and the car is showing no error codes.

I am looking for advice/ideas.

If you replaced the air filter the air box cover had to be removed.

Check to see if a sensor got unplugged or if an air leak was created between the air box and the throttle body.

Tester

How are you calculating your gas mileage???