You should get better than 2 mpg with the 150. I had a 20 seafari with a 150 black max of about 1978 vintage. We loaded the boat very heavy(3 divers, 9-10 tanks, 100-150 lb ice) most of the time. I don't remember exactly what my fuel consumption was, but for sure it was a little better than 2 even when loaded heavy. 45 gallons was enough(barely) to run 40 miles offshore and back, plus idle around for 6 hours or so. When it was light, fuel consumption went way down,
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