89 octane -- what's the point?

[carltalon]

Originally Posted by Shane55113

Its the 91 and the 87 mixed together literally they have hoses from each tank Y into the 89 pump handle. Just ask Gofastman, he works at a independent shop that sells gas and his boss showed him.

This is what I've heard too. There is no 89 tank the 87 and 91 just mix in the pump to make 89.