Some guys claim a lot better, but I burn about 4.5 GPH at a cruise of 80-85 MPH in my Avid MK IV with an 80 HP Jabiru for engine. RPM is about 2700. With my 582 that I had before in the Avid, I would burn about 3.5 GPH, but I usually ran about 5200 RPM with it. Cruise with the 582 was about 75 MPH.
Jim Chuk