wife put 89 with 91 race tune

[02GTRX]

Brilliant I know...but question is what do I do now? She only put 15$ which is like 6gallons, can I put the stock tune and leave the intake on? I have 2 91 tunes and a 93 on my tuner. Or can I just burn the remaining fuel by filling up 3/4 91+ the 1/4 tank of 89 thats in there?

 

[darien87]

Just fill it up the rest of the way with 91 and you should be fine. Just don't romp on it too hard until you put in a full tank of 91. 89 octane on a 91 octane tune isn't too bad if you go easy on the car.

 

[02GTRX]

10-4! Thats what I wanted to hear thnks
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[oh9mustang]

Drive your car at around 20mph, put it in 3rd gear and push down on the gas, If the engine starts to make a pinging noise, stop this and put some higher octane in it, If it doesn't ping continue using the cheaper gas.
Low octane fuel (87) is like racing gas, it ignites much easier than higher octane fuel (93) . Putting 93 octane in a car that uses 87 octane will make the car run worse.