Maybe the mix does achieve 89 octane though since the 90 E0 is the base for 93 E10. When it meets 10% alcohol it gets 3 more octane points.
Mid-grade is often priced higher than mixing it yourself though, and overall it is just another thing offered to the market that almost no one should buy.
Mid-grade is often priced higher than mixing it yourself though, and overall it is just another thing offered to the market that almost no one should buy.