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Discussion Starter #1
Hey guys I just recently got a 91 octane tune for my 2015 mustang. I live in Colorado hence the 91. Due to some unforeseen circumstances I and most likely going to have to move to FL. That being said the tune is for 91 and 93 will be the highest octane fuel I can get in FL. If I swap to 93 will it have any negative impact on the performance of the car?
 

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As long as it's not a custom tune for high altitude, you'll be fine. It's better to use 93 octane regardless.
 

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Discussion Starter #3
As long as it's not a custom tune for high altitude, you'll be fine. It's better to use 93 octane regardless.
That was what I thought I just wanted to ask around just to be sure. Yea I would use 93 if Its available just don't have it up here in Denver.
 

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You'll have more knock protection using 93 octane on a 91 tune, but the power gain will be minimal unless you switch to a tune for 93 octane, but there will be no adverse side effects.
 
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