In California differences in yield primarily come from vines planted at different densities per acre and the way the growers manage their vineyard throughout the season. In the interest of producing denser wines with more flavor, producers usually cut back on the amount of fruit. Higher quality fruit will often sell at higher prices, and a lower yield requires less effort at harvest. So there is a balance between quantity and quality, depending om the grape grower's goal.
A winery's production is expressed in cases (12 bottles) of wine per year. A small garage-type winery usully produces between one thousand to ten-thousand cases a year. Extremely large producers, such as Beringer, Gallo, and Fetzer produce over five million cases a year. To estimate how much wine a typical acre in Temecula can produce, you can use an average vineyard yield of 4 tons and that a ton will make 150 gallons of wine. An acre would then produce 600 gallons of wine, 3000 bottles, or 250 cases. So how many bottles of wine are produced by one single grape vine? 4-6.