Sounds like that's about right. Using a liquid, I don't use more than an ounce per vehicle, usually. Some waxes/sealants spread better than others, so I may use only 1/2 an ounce and still get good coverage. When using a paste, I usually can't even see that I've taken anything out of the can until I've done about 3 cars.
You are right about the "more isn't better" plan. It just leaves more to wipe off.
You said you "work it in" - are you referring to a cleaner wax? I usually just apply/wipe on my lsp's, since they don't do any cleaning. I have, however, heard of the "spit-shining" method, where you would need to work it in. I tend to use more wax if I'm using a cleaner wax than a "pure" lsp, just because I'm trying to polish too.
