Mixing gas is a hassle so I stopped doing it years ago but my cars run so much better on 93+ so just the other day I purchased two 5 gal cans of 100 octane to mix with the pump gas to give me around 93 octane. I tell you, different cars, the BMW with MFI is like a new car smooth and peppy, the Porsche is transformed. How many out there mix gas?