Hi,<br /><br />About to buy a 1990 Yammy 50 2/s on a 19" Orkney (approx 700lbs I think). Current owner is a marine engineer so no probs with engine state and service record.<br />With say, 3 adults, what sort of mileage/fuel economy could I expect from a 25 litre tank(UK measure)<br /><br />Cheers