If you guys are talking about the 10% ethanol blends at the pump, provided it really is only 10% or less, it shouldn't greatly affect your tunes.
For the rest of us, it might give you slightly richer fuel trims and run a tad leaner under load, but unless you are tuned to the ragged edge, it's unlikely to be a cause for concern.
That said, anyone who is boosted should consider investing in a wideband and gauge so they can monitor AFR's under load anyway...
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