I have gotten as high as 26 on a long trip. The book I keep is accurate. I have made 8 trips to KC and 2 to Maryland and one to South Carolina, the milage has been consistently in the mid-20s average for all those trips. The around town is off also about 2 miles to the gallon. I am going to reset the timing first. The unfortunate thing is I don't have a long distance trip planned until spring.