I did that last summer, but traffic would be good some days and just death (15 minutes to get on the freeway less than 3/4 mile from work!)...
I put in about 4oz per 11-12 gals. I found a site that some guy made, he had charts and all that good stuff, now its just a matter of finding it again since my old computer died and I lost all my bookmarks. He seemed legit so I'll start a search for it.
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