I live in northeast Ohio and recently returned ftom a one week trip to the Charleston, SC area. At the beginning of the trip I reset Trip 2. I drove over 2,000 miles. On interstates I drove at the posted speed limits of 65 - 70mph. In SC my driving was about 60% 55mph roads and 40% city driving. Temperatures were upper 40's to upper 60's. When I returned home I checked mileage and I averaged just over 41mpg for the entire trip.