Ok, the boat - 21' 1992 Thompson Calae - 4.3 vortech. 20 gallon tank.
I want to make a trek from Cedarville, MI to Mackinac Island, MI (Lake Huron). Google says its about 18 miles one way. 36 round trip. I figured it would get at least 2 mpg... lol, but hey, I dont know, so Im asking... hate to...
