I found an article on a long term test with a number of cars on Stock tunes from the factory , one being our 3.5L in the F150 putting splash blends of E30 in there with amazing results. No check engine lights , no negative effects. Fuel milege slight gain and big power gains on dyno runs compared to 93 octane e10 . Stock tune! Check it out! Goes to show why getting a 110% dialed in e30 tune i hear pulls like a SOB and puts out unbelieveable quarter miles
http://www.sdfu.org/assets/docs/uploads/gle-e30-challenge-white-paper-1-19-17final.pdf
http://www.sdfu.org/assets/docs/uploads/gle-e30-challenge-white-paper-1-19-17final.pdf