think its around 11.5 inches. doing this from memory. should be able to do a search and find it. also thought somebody put it in the links section.
best thing to do is track your mileage with your gps. with a 150 merc, your going to get around 2 mpg. top your tank off, reset your trip on gps. when you get 30 40 miles on it. top off tank again. that will tell you your fuel burn.
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