Our average
We have averaged about 0.5 gal/hr motoring in and out of channel and normal weekend type sailing. With the throttle running at cruising speed (2800 rpm or so) all day on long trips with no wind, we burn about 0.75 gal/hr. I figure on 0.75 gal/hr to be on the safe side when figuring when to fuel up. I have also read on this forum reports that the H34's actually ended up with a 20 gallon tank even though specs. say 25. Not sure if this is true or not, but I only count on 20 gallons being in there to be safe as well. That would put me filling up at least every 25 hours or so to be safe.