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Yea guys i tune my truck back to stock to tune it with 89 tune but my cortex superchips doesn't have it. It only has 87,91,and 93 tune. But i had put 89 octane gas on my truck to tune it with the 89 tune, but i didn't have a option so tune it back to 87 tune, will i come across problems if i keep putting 89 octane on the 87 tune? thanks everybody, for the help.
 
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