You know, you guys could have just read Consumer Reports about this and saved us these long, lengthy explanations from a guy who waits at the gas pump until the person in front of him fills up with premium.
Texas, glad you found it interesting. It is a very complex topic not appreciated by most. (especially Dr. Frank) As I stated earlier Chip posted a VERY interesting post on fuel blending requirements by different counties he serves. It is quite amazing (if still valid) how you cannot ship/transfer fuel product from one county to the next due to regulatory requirements. Perhaps Chip could dig that gold nugget out and repost. It was good!