I know that when there's an "e85 cel" that it's near stoich or a bit lean... which I LIKE.
I should add, if you have cold winters like Minnesota, you will want to back off on the strength of the ethanol in your blend; it can lead to hard starting. But once going it's just fine. I wished I had the dual tank set-up from an awd Tempo to transplant into my fwd Tempo- one for e10 and one for e85 in the winter... both for e85 when it's not brutally cold.
P.S. Because e10 ONLY FOR COLD STARTING in winter; switch to e85 after a few minutes. e10 tank probably last all winter...