1 cup of bleach for 60 gallons for me and I just pour it into end of water hose attached to house. My 2 water hoses that are onboard of coach is what I attach to house/RV during sanitizing process. We are also fortunate enough that we have city water cuz the process calls for 120 gallons total. BTW, 1oz/gallon isn't right. Figure just a whisker under 1.5 cups for 85 gallons. Sengli is right if 1oz/gallon------ that's a LOT of bleach.
FWIW as well, I found/use just reg plain Clorox (non scented) that's used for the RV only. IMO, I don't trust non Clorox brand bleach as I heard it's diluted more.