Ever since I started having to use the A/C here in Washington, DC my average MPG (in stop & go city driving, 5spd) has dropped from mid to high 50's to the mid 40's and sometimes lower. I have lost an average of about 10 MPG because of the A/C, even with Econ on. Is this about the size of the MPG hit that others have experienced once the summer starts? This is my first summer with the Insight.