I get a bit better than 17 in my standard daily driving cycle, which is city/suburban with lots of stoplights but also some stretches where I can cruise a bit. My commute is only 5.5 miles, though, so it's not ideal for mileage. I think it does very well under the circumstances, and it has improved with some miles compared to new.
I just did a 650 mile trip lightly loaded with lots of mountains (good and bad), but also with speeds rarely in excess of 65, and I got 22.4 mpg. I was very pleased with that.
Freeway tends to vary a lot depending on temperature, wind and speed. I've gotten as good as 20 and as bad as 13, so it can really vary.
I haven't towed the fifth wheel enough yet to have that mileage dialed in. Give me a week on that.