Of note for those looking to compromise a few MPG for a comfortable smooth sportbike that can do 172 MPH, (from first hand experience) corners with the best of today's streetable liter bikes, holds 5 gallons of, for the most part, 87 octane fuel, it is the 2000 - 2003 California EVAP specification Kawasaki Ninja ZX-9R. It does 48 MPG in stock form and it'll do well over 50 MPG if you can keep it to speeds below triple digits, off the race track.
Do the math on that and you'll see what kind of range the bike is capable of. It's a sportbike. A bike equally at home riding across town, across the state or into the mountains to tilt some horizons. Think of it as a zesty economy bike. One that'll put a smile on your face every time you twist its throttle.
It won't win a Vetter Fuel Economy Challenge of holding four bags of groceries upright or going 180 MPG, but at the speeds it's capable of, if it ever went by one of those wind-tunnel bikes at speed, it might just remove those bags from the other bikes.