Mixing ratio for 110 and 91 octane to get 93 octane?

110 minus 91 is 19. 93 minus 91 is 2. Therefore mix 2 parts of 110 to 17 parts 91 to get 93. Like, 2 gallons of 110 to 17 gallons of 91 to get 19 gallons in your 20 gallon tank.

This is a cool calculator for figuring octane mix ratios - http://wallaceracing.com/octane-mix-calc.php

Visit gas pump that sells 93 Octane???

Tell your math teacher they don't sell 110 octane gas.