We just returned from our Christmas trip of 1702 miles in the MKZh. Went to Lexington, KY on a 60 degree day. The next morning it was 22 degrees and we went to Michigan and the temps went from a high of 22 to a low of 9 degrees with snow and an ice storm. Then to Ohio where the temps were a little warmer...then back to PA in 45-50 degree sunny weather. Mileage was mostly 65-70 MPH with some 75-80 MPH legs. The car was loaded with luggage and Christmas presents and we averaged 40.8 MPG for the trip.
The car drove great and it was an extremely comfortable trip.