Two Questions.

I just bought a 19.5 2005 Alumaweld stryker with a 175 merc sport jet. Does any one know how big the gas tank is?

I would like to know what people think about the automatic oil injector, mixing oil/gas just before the carbs. Iv'e heard that it should be disconneted and just mix the oil your self in the tank. What are your thoughts on this?