Stop in for a cup of coffee

About 300 miles, it gets 1.3 MPG! Holds a small fortune in gas.
thats a huge tank. My grandfather has a late 80s Mercruiser. Inline 6 cylinder. It gets about 2.5 on calm waters at but a lot of that is near wide open throttle too. I've got to do some work on the engine as it runs really hot