Check engine light at LFT of 28.2

I finally received a check engine light when I had a scanguage LFT reading of 28.2. This would represent an ethanol reading of between E56 and E60. This is similar to what two other individuals who drive my type of vehicle have posted. What is interesting, I drove a full day at this ethanol level and on the second day, I received a check engine light due to a too lean condition. This indicates it takes 12-25 miles before the oxygen sensor records the correct ethanol concentration and throws the check engine light.

Getgo has E85 priced at $2.55 while E10 is at $2.88. Drove home with two stops and recorded a 31.9 mpg reading with the temperatures in the upper 40's. Yes it is no longer summer.