Thanks, everyone. I am in northwest Indiana.

I am looking for a red variety, that's why I was thinking frontenac.

*** Any other red varieties I should be looking at? ***

By the way, in answer to my original question as to gallons per vine,
Jeff Cox in From Vines to Wines says a mature vine yields 8 to 12
pounds of grapes and that 11 or 12 pounds of grapes yield a gallon of
finished wine. p. 28