I put on Cooper Road and Trail, upsized from 225/60/R18 on Lariat to 235/65/R18. I like the look and the added height/side wall, but the MPG monitor shows mileage dropped to about 4-5 mpg. Used to get an average of about 29-30, and over the first 1,000 miles, it is averaging about 24.5 mpg. I know I can't rely on this because of the increase in size, but I also can calculate it manually because the odometer is off. The tires are a little noisier (not a lot) but the ride is noticeably harsher over bumpy road sections. Michelin Primacy A/S was stock and lasted 50,000 miles. I am contemplating getting forscan to correct the computer, but also not sure if Ford or another shop could recalibrate for the larger tires. Any thoughts?