mskibinski (your name is fun to try to pronounce) - If you are going from a 21 mile commute at 55 MPH
, to a 5 mile city commute, then going from 45 MPG to 36 MPG is not all that unusual, and possibly to be expected. 21 miles at 55 MPH
is pretty much optimal from an MPG standpoint.
Strangely, I used to have about the same thing as you, but concurrently. My commute to work is through about 5 miles of city/suburbia; and I used to regularly go to play soccer at lunch times, about a 22 mile drive, partly through the country at around 55 MPH
. The difference that made in my mileage was about 7 MPG.
The good news is that you will probably adjust somewhat to the city driving and your mileage will then improve. Best of luck!