LOTO Rough rule of thumb,10 gallons per hundred H.P. W.O.T.
inboard or out.I have a 30' Shadow with 2100H.P. about 1 Mile
to the gallon at cruise.(120)I have seen triple out boards on the same
size tunnel get less at same speed but there W.F.O.Just depends
on you addition to speed.
Insurance depends 500 to 2000