I just finished my second full tank on my Interstate- both right at 140 miles when the light came on. My first tank (from the dealer) was short, they didn't fill it all the way up.
I feel really blessed. From day one, I have ALWAYS gotten 45 mpg +- a 1/2 mpg on my Interstate. I use regular unleaded and my light ALWAYS comes on at 160 miles. Now with that being said, I don't know the riding habbits of any of you, but I do not ride hard. On occasion, I might get on it from the stop, and might even run it up to about 90+- but for the most part (99% of the time) I ride it like a cruiser, not a rocket. Call me old (better not, you'll be there one day ) but I just like to take my time. Hell, I even look for a longer route to work now, just to enjoy the ride.I have been getting 44 to 46 mpg with my 2010 stateline.It's stock and with mid grade gas..