Difference in fuel pumps?

I keep hearing that; but I've been using strictly 87E10 in my S since 99 with zero issues.So perhaps our Northern gasohol is different from American gasohol. Or I'm just lucky, I guess. Maybe I should change my "handle" to Lucky AJ.
Well strictly isn't quite correct. One time I went to the Racetrack, and ran a few gallons of premium 89; maybe 5 at most.