Mine has about 1.5 gallons left when the "empty" light comes on. I get close to 40/42 mpg however I ride it. I weigh 190lbs. big bore kit and short TORS.
Sounds like a good comparison unless someone else is way off from that. I weigh almost 100 pounds more than you and my 1600 runs from 47 to 50 mpg. I don't baby it, but I don't play boy racer either. I have ridden with more aggressive friends and gotten into the low 40s, so the 1700 is not a huge penalty on mileage but there is a small difference.