I only have 5,000 miles on my 2017 FFH that I bought in late January. Most of my driving is between 50 and 55 mph with the speed control and eco mode on. For the first few months I got mid 40's mpg, with warmer spring weather, that improved to near 50 mpg. Most of my driving has small hills and shallow creek valleys, and I use the speed control to roll up to the speed limit through valleys and reduce the speed a few mph depending upon how steep the uphill gets.