Your truck doesn't know how to read the manual. You are either going to have to use high octane, use a different tune, or get custom tunes if PHP is still custom tuning that device on that year truck.

 

why not try supreme with level 3? its only what, 10 to 20 cents a gallon more than midgrade? worth a shot! To me midgrade isnt worth the extra money from 87. Now from 87 to 91 92 or 93 octane is worth the extra money

 

so why are you posting up here?? do you want to solve the issue or are you going to counter any and all advice given to you?????

 

Not sure where I have countered ANY advice given, actually it's quite the opposite. I am in the process of running out a tank of gas with Techron added before filling up with 91 and trying out level 3. Maybe the question should be why are you posting here since your posts have been less than helpful.

Thanks to all the people who have offered real suggestions.

 

that makes no sense, so anyway, report back after a couple tanks of 91 octane