Diamondpilot said:The station has 87 and 91 and mixes about 50/50 to make the 89. Not sure if its true or not but makes sense to me.
Not true as number two said...it takes less 91 to make 89 when blended from 87. That's why I consider mid-grade a rip off..if you want to save a little you can mix your own mid grade from about 1/3 premium and 2/3 regular, even though they price it like it is 50/50 it isn't.
Around here mid grade is almost always exactly in the middle between regular and premium in price even though in mix it isn't