Last week we drove to and from Minnesota to Ohio using HV mode. Driving the hilly Minnesota I-90 at 34 degrees and 72 mph we got 38-39 mpg. In less hilly Wisconsin we got high 40's in 50 degrees. Illinois to Ohio gave 55-58 mpg at speeds ranging from 69 to 72 and 60 degrees. Terrain and temps obviously make a difference, along with speed.