Just Bought A New Boat With A 99 Johnson 200hp Ocean Runner. The Boat Has A 134 Gallon Plastic Tank That Is More Than Half Full.boat Has Been Sitting Since 2005. Theres About 70gallons In It.should I Pump Out This Gas Or Use It. I Dont Know If I Should Mix This Will Newer Gas. I Havent Started The Motor Up Yet. Thats Alot Of Gas To Waste.