Last week I had a four trips of 30+ miles (two were 65 miles) where I got over 40+ mpg every time with a high of 45 mpg. I was mostly cruising on the highway (probably about 90% of the drive) with speeds of 65-75 mph. Also note, that I am also tuned and still go this good gas mileage.
Yep. Averaging 43 mpg. Since I took the picture below, I've had two more tanks at 44 and 43 mpg each (400+ miles). I have backroad drives to/from work (55 mph whole way, 28 miles roundtrip 5x/week) and to/from the gym/grocery (35 miles roundtrip 3x/week, mostly 55 mph then ~10% 45 mph). The 30-something mpg tanks in the pic below are from interstate runs (80+ mph).
Just got back from a trip to the Grand Canyon, Vegas, Zion National Park, Arches National Park and Durango. Most of the trip was 70-80 mph, though a lot of it was through the mountains on roads that were winding with lots of steep hills.