It depends if you are talking about highway or city and which model.
not to far
200 miles
525 miles
About 360 miles
20 miles a gallon
That would depend on the size of the fuel tank. As a go-kart is not street legal the question is a mute issue.
you will get roughly 30 miles if its a mazda 6 td 136 brake ,on a reserve tank
105
A boat can go indefinitely far. If talking about a particular craft based on a full tank, and without using oars, sails or other non-mechanical propellants, you will have to be more specific.
If your "fun" tank of gas is a full tank of gas you should be able to go nearly 300 miles. The Honda CB125's were known for phenomenal gas mileage getting around 100 miles per gallon.
567 miles 27x21=567
The reserve tank of a 2008 Honda Shadow 750cc will take you about 20 to 30 miles depending on how you drive the bike.