A ton of grapes makes 140 - 165 gallons of wine. About 2.37753 (2.4 rounded off) gallons of wine are required to fill a case of twelve 750ml bottles. Each ton of grapes will make 60 to 65 cases of wine (62 cases rounded off.) Another fact would be that an established vineyard can produce about 6 tons of grapes per acre per year. A vineyard takes about 6-7 years to become established. The average number of cases is between 62-63 cases for every ton of grapes. Also 31.75 pounds of grapes = 1 case of wine. Sources: http://www.bergmanvineyards.com/glswn.