Has anyone been able to successfully enable Flex Fuel on the 2.3 EcoBoost Mustangs where the Inferred AFR Stoich matures and isn't always Actively Learning, and you're seeing LTFT data?

Even if it never matures and doesn't produce LTFT, it should run fine even on full E85 but I'm inquiring solely about whether you are seeing LTFT data and if the inferred AFR actually matures. Or if your Inferred stoich keeps fluctuating at every drive cycle.