Originally Posted by TORQUERULES
I'll try to scan that page into PDF at work tomorrow and post. My Focus was built 10/11.
No you are correct. I did find that in the 2012 owners manual. However for some reason it currently doesnt say it in the 2013 manual. I will say that I just gassed up with 93 Octane from Shell and did notice an improvement in the initial feeling of the engine and mileage for the short time I drove it. I will be able to report actual finding within the week.