Will 93 octane with 91 octane tune hurt

[rjkrumb]

I will be heading to Pittsburg from Nebraska only 91 octane here but 93 octane available the farther east I go will it hurt to put 93 octane tune in before I leave probably only 1 tankfull of 91

[06MonteSS]

using a higher octane gas than what the tune is made for is fine.. so with 91 octane tune, yes you can use 91, 92, 93 octane gas..

but you can not use lower.. i.e. do not use 87, 89 octane gas with a 91+ octane tune..