Octane Booster
Race Director
Joined: Jan 2014
Posts: 10,709
Likes: 7,099
From: Fulshear, TX
Pro
Joined: Aug 2019
Posts: 566
Likes: 566
From: Kansas City
Modified C8 of the Year 2021 Finalist
The car still runs great on 91 octane even at high speeds in hot temperatures. 
I wouldn't waste your money on a booster.
I wouldn't waste your money on a booster.Last edited by bad mooofooo; Sep 27, 2021 at 10:14 AM.
Race Director
Joined: Sep 2016
Posts: 13,180
Likes: 10,515
What state are you in? More importantly, at what altitude? Octane requirements drop at higher altitudes, because the lower air pressure effectively reduces compression in the cylinder. But as mooofoo says, the car runs fine on 91. Thousands of C8s are driving around California on nothing but 91.
Burning Brakes
Joined: Jun 2000
Posts: 1,112
Likes: 95
From: Blue Springs MO
Race Director
Joined: Aug 2016
Posts: 12,704
Likes: 10,131
From: Garden Valley CA
If you decide to use an octane booster be careful which one you choose. Many octane boosters contain MMT or other metals. The owner's manual has a specific warning to not use fuel that contains MMT or other metals.
Last edited by RKCRLR; Sep 27, 2021 at 11:25 AM.
Race Director
Joined: Sep 2016
Posts: 13,180
Likes: 10,515
Interesting. I wonder if the change to the fuel injection system for 2022 is behind the recommendation difference, or if they just decided to change the words.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
Race Director
Joined: Aug 2016
Posts: 12,704
Likes: 10,131
From: Garden Valley CA
I'm curious also. My understanding is that the LT2 SAE rated horsepower was obtained using 93 octane. I wonder if 93 octane is required to get the rated horsepower under some circumstances.