The quantity of grapes required to produce a gallon of red wine will differ depending on the grape range, and the specific wine being made. A heavier bodied wine like a Cabernet Sauvignon will require more grapes than a light bodied white wine like a Pinot Grigio.
https://publicpush.de/?p=891 The amount of grapes needed to produce a gallon of wine will vary depending on the grape variety, and the particular white wine being made. A much heavier bodied white wine like a Cabernet Sauvignon will require more grapes than a light bodied red wine like a Pinot Grigio.
So, to answer your concern, you would require to squash around 12-14 pounds of grapes to make one gallon of red wine.