Actually, I think you meant a gallon, unless you were gonna go halves with someone
gallon gal. American: a unit of volume used in liquid measure, equal to 3.785 liters or 4 quarts or 64 fluid ounces
Personally I find mayo on the same level with some other milky white substance -- I've never tasted either, never will.
Edit:
Well that's weird...1 gallon = 128 oz. in every other universe...that's what I get for using the internet