Quote Originally Posted by colo525i
The gas blends are on a state or metro area basis, as mandated by the epa. I cannot find any sort of table to break it down on a state by state basis. In colorado, the winter fuels are required to be 10% ethanol, but not for summer. States like nebraska have (or at least used to!) to have 4 pumps 87 89(10% ethanol) 89 and 91. The higher the compression ratio the better when dealing with ethanol blended fuels. My m50 525 seems to be fine on the stuff, but i have seen older lower compression cars that run like junk on the winter fuel (my dad's old volvo 740) Look up the rules for your surrounding area, they may be required to sell fuel with ethanol.
I looked & couldn't find any friggen info, it's tickin' me off. I am pretty certain my area does require it in the winter. My car doesn't run any markedly worse though, just don't want to put the crap in my car that wasn't designed for it.