If ethanol is so great for performance, why isn't the Mustang set up to use more than 10%? The GT is an ACTUAL performance engine/vehicle. The Expedition is not. It is designed to tow and haul people. Apples and Oranges. I don't any benefits running anything higher than 91, in an engine that is only 10.5-1 compression. Lower compression is better for towing.
Ethanol results in a net increased octane rating. However it's nasty stuff regarding the corrosive properties. 0% is the safe range that the plumbing and seals can take without compromise. Anything that runs a higher percentage of ethanol requires different o-rings, soft components, etc. As those concentrations of ethanol are not available everywhere, it's cheaper for Ford to produce one version that's good for all.
Not getting your lower compression is good for towing statement. It will burn cooler, yes but with less power all things being equal. Higher compression makes more power. If the octane rating is adequate, it won't detonate and ruin things...