17 SH-AWD Tech. 43K miles. Just drove from TN to southern FL. Two people, suitcases and coolers. 75-80 mph all the way except a bunch of stop and go in downtown ATL. 1st tank was 28.9 mpg on 92 octane with outside temp between 40-60. 2nd tank (partial) was 28.4 on 89 mid grade with outside temp between 52-70. Cold in FL today. If the temp was around 80, probably would have hit 29 plus mpg. Everyday driving around the neighborhood in TN averages 23 mpg. Very happy with this mpg.
Anything under 24 mpg hwy would be a concern with a 3rd gen MDX, but so many things effect mileage. Temperature, type of gas, wind, tire pressure, weight in vehicle, driving habits, rain, etc. Driving to the upper Midwest last fall, I only got 24.5 hwy. Was going against a 15 mph headwind most of the way with temps in the 30-40 range.