My car supposed to get 23 mpg but is actually getting 11 mpg?

Ford Escape 2001, 209k Miles on it. Is this normal? Or is something wrong?

I'm not surprised at that mileage. Trade it in for a newer smaller diesel. 80 mpg will be realistic then.

Answer in miles. Your Ford is dying

Check air filter, plugs, EGR system, exhaust outflow, compression, tire pressure.

Pull out and read the spark plugs. It should tell you what's going on. Check if the oil smell like gasoline, maybe your injectors are bad/leaking.

Its worn out and in need of some tlc and a good service

So your question is: is it normal for my car to get 48% the mpg it should. Answer: No.

My question: how many miles since it had a complete maintenance?

Old car, bad spark plugs, clogged fuel injectors, carbon buildup.