I only get 28 MPG with my 34,xxx miles 2.5L.
If the tire diameter in creased with the wheel change, that changes the tire circumference which in turn slows the speedo reading and miles driven. Get the speedo calibrated for the tires. Mileage might not be as bad as you think.Ever since I swapped the 16" wheels to 18" my gas mileage went down a little. Average now is 30.1 and this is the 2.5L