Anyone using Amsoil SSO (or the revised AZO) formulations are wasting their oil if they are dumping it less than a one year interval, or 15,000 miles, whichever occur first.
This has been proven with multiple UOAs. You are using an advanced lubricant that far exceeds the specifications and performance of the standard "off the shelf" big oil company formulations. Do not waste it, please....I beg you.
If your tune is bad, causing a lot of fuel dilution, then yes....it can shorten your oil change intervals. However, I have yet to see a fuel dilution issue with E85 in new Ford modular engine.