Quote:
Originally Posted by SmallermouseZ
I don't have a tune for 94but I use 91. What happens if I use 94 without a tune?
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You may see a slight improvement in performance because your timing may advance a bit. The higher the octane the more timing advance up to a limit. For the extra couple bucks per tank full I'd keep using the 94 octane. I wish we had it. The best available here is 91.
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Vette: 355 cid, 400 rwhp
'13 CTS-V Coupe: 6.2L LSA, 556HP
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