Ring Free Plus?

I just bought a couple of 3.2 oz bottles of ring free plus and it has on the bottle that it treats 5 gallons of fuel. I've seen on several sites that 1 oz treats 10 gallons of fuel.Which is it?Did I get the bottle intended to be used in a motorcycle?If so would it be safe/effective to treat 30 gallons of fuel with the 3.2 oz bottle?