I have had my ZRX1200 for four months and I have put almost 2800 miles onit and have consistantly got at least 45mpg (about 73 km/h) My bike is all stock except a 1-tooth down on the front. After the sprocket change it still gets around 40mpg (70 km/h or so) If I go out and just go for a long ride on the twisty backroads and some nice smooth roads it´ll get 50mpg all day (84 km/h). on the lenght of a tank of fuel, i switched on my reserve this morning at 128 miles (190 km/h). I am 6feet 1 inch tall and I weigh 228lbs (105 kg) and i don´t ride the bike really hard. i just ride hard in very short spurts, bout half mile or so. Never race, maybe a drag race here and there, I just driveto work and on short trips, 150 miles or so.