My highest MPG in the city has been 21 MPG

Highway, highest 25 MPG @ 80 MPH. I average around 24 on the highway with the air cond. on @ 80 MPH.

With the air cond. off, and in warmer weather, I get better mileage. You're correct, it does get worse MPG when the engine is cold. It gets a lot better when it's warm and the longer you run the engine. I get 18-20 MPG in the city with the air cond. on when it's summer here in the Midwest.

Craig