I can't imagine what fuel would cost to run these things.....Just think if they ran race gas.
We run AV Gas and 1 tank of 91 for getting home or just running easy. If AV gas is to much of a Pain in the Arse to find on the water 91 will work fine but the spark plugs load up on extended Idle out to Sea when Going out at New Port or lots of Idling. Gets Spendy when you run a lot.