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[QUOTE=KingLT1;11169206]I am not sure why. These cars are tuned for E10 fuel. And E10 is higher octane then 93. So you are only going backwards.
Typically any E10 fuel is created by blending 10% ethanol with a lower octane base fuel to reach the desired octane rating. Thus 93 Octane is typically 91 octane gasoline blended with 10% ethanol. In other words, the 10% ethanol blend is roughly a 2+ octane rise in octane rating. You are getting what the pump advertises, not some octane 2 points higher.
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2018 ZL1 M6 NGM
PPF and Ceramic coating
IG: NGMZL1
2010 2SS RS --- SOLD
MODS-
Performance: BMR trailing arms & bushings | BMR Toe links | X-pipe | Muffler delete | Vmax ported throttle body | Apex "strong" MAS | Vararam CAI | Apex catch can | Kooks Headers | Kooks HF Cats | Dyno tuned by GPI 417 RWHP 409 FT-Lb
Cosmetic: painted Zl1 rockers | Zl1 grill | AAC side markers | AAC LED backup lights | windows tint | taillight tint | JDP tow hook | all emblems blacked out | LED fogs
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