Flashing with the MHD Wi-Fi is terrifying the first time but DAMN its fast.
With flashing this fast I find flex fuel unnecessary especially when you can do this whilst checking your tyres as I only use e85 maybe once or twice a year.
The beauty of flex fuel is not found simply running straight 93oct then full E85 every so often, it's for all the in between percents and not having to worry / measure.