What octane fuel are you running?

[Bumflik]

E85

 

[Bumflik]

Your dealer flat out lied to you. The Z is 91+ per the owner's manual. Putting 87 in would be just asking for reliability/durability problems.

Premature detonation or "knock"

 

[50thZ]

I will use 91 on occasion to keep things honest.

 

[SleepyD7]

I've been using 94 Sunoco. With traction control off, with 94, my ass violently swings wide when I punch it into 2nd gear. On 93, it's more like a quick twitch correction. Worth the extra money? Prolly not. Next tank prolly gonna be 94. Can't wait for port injection and flex

 

[Drago86]

91 Cali crap gas. Also of note, the STOCK TUNE frequently has audible pre-ignition around 6-6.5k on 91.

There is one station anywhere near me that stocks unleaded race gas, sometimes I stop there and top off and the car LOVES It.

 

[DBZinTN]

I've been running 93 Tier 1 w/10% ethanol, but have been tempted to try no ethanol 91 from same station. It's usually 10 cents higher than 89 w/10%. Saw a post 93 to 91 no ethanol loses a few HP. Doubt I'd not kniw the difference with my weekend scoots. Hmm..

 

[KrackaC8]

Ethanol is an excellent knock quench, especially for turbo cars. I've seen 89 E10 outperform 91 E0 in boosted applications on the dyno. No way would I downgrade from 93 E10 to 91 E0.

 

[DBZinTN]

Ethanol is an excellent knock quench, especially for turbo cars. I've seen 89 E10 outperform 91 E0 in boosted applications on the dyno. No way would I downgrade from 93 E10 to 91 E0.

Good to know thanks.