28psi=mix that shit 1/2 and 1/2 with 93. 1/3 to 2/3 if you are nervous but if it was my car it’d be mixed 1/2 and 1/2 for 28 psi no questions asked. ~103 MON is enough for 28psi, I ran 30psi on 105 MON for 55 gallons of fuel with no problems.
28psi=mix that shit 1/2 and 1/2 with 93. 1/3 to 2/3 if you are nervous but if it was my car it’d be mixed 1/2 and 1/2 for 28 psi no questions asked. ~103 MON is enough for 28psi, I ran 30psi on 105 MON for 55 gallons of fuel with no problems.