For some reason I don't seem to get more that 18MPG on my 2018 Odyssey EX-L. It doesn't matter if it is in the HWY or the city streets. I do a mix of city streets and the HWY but, while on long trips on the HWY the MPG is not improved. I mean, it gives worst MPG than my previous 2006 Ford Expedition with all 8 cylinders! My 2018 Honda Pilot, with same engine but 6 speed transmission gives me 19.1MPG.