[duffyt]

DJD,

Rule of thumb is use 1/3 of fuel out, 1/3 in, and 1/3 contingency (you don't want to run out of gas in the ocean...it can cost you big!). Capacity is 70 gallons, depending on how your boat is performing, weather conditions, weight on boat, your engine model / HP, etc. you may be able to achieve a 200+/- mile range. I would start by doing some lite off-shoring at first (5-10 miles) and collect data on your trips (the owners manual has a chart that you can collect info). You can estimate from there.