I hate to admit I can't remember, but if our OEM tires are 216/65R16's and you're off 3 miles per hour (low) at 60 miles per hour then going to 215/70R16's will get you 2 miles per hour closer and thus more accurate readings on the odo and milage gage. (215/65R17's will pick up 2.5mph at 60 / 215/60R18's will pick up 2.8 miles per hour)

All these combinations should get the TCH closer to accurate at 60 miles per hour