WavMixer

After browsing through the just released C8 owners manual I noticed it says that 93 octane is required and use of 91 octane will void the warranty. Here in California 91 is the highest pump premium grade you can get without going to the track to get 100 octane. So what's up with that? Will us Californians have to add octane booster? Perhaps fill up at the track? Move out of Cali? Inquiring minds want to know.

Jeffro19

Just move. Lol just kidding. I don’t think it will void the warranty I thought it said reduced performance and fuel mileage?

RichieRichZ06

It doesn't state that 91 will void the warranty. It states that engine damage from using a fuel with less than 91 octane is not warranty.

Copy and paste from the owners manual.... Use premium unleaded gasoline meeting ASTM specification D4814 with a posted octane rating of 93 — (R+M)/2. If unavailable, unleaded gasoline with a posted octane rating of 91 may be used, but with reduced performance and fuel economy. If the octane is less than 91, the engine could be damaged and the repairs would not be covered by the vehicle warranty. If heavy knocking is heard when using gasoline rated at 93 octane, the engine needs service.

Do not use any fuel labeled E85 or FlexFuel. Do not use gasoline with ethanol levels greater than 15% by volume

tooold2race

He's right! MOVE.....

Seriously, we've run pump regular unleaded in many of our new Corvettes since the 1990's with no impact. Then again, we don't track em' any more so the performance loss was not an issue. I believe the State of California has a different way of measuring 'octane' and that's why it shows a lower number at the pump.

CitznFish

Honestly, what kind of performance hit would one take if using 91 octane vs 93? Can't even be measurable IMO.

brAnd7onX

I moved out of Cali 5 years ago and never looked back. You can do the same.

Easy Mike

Have you ordered a C8?

proeagles

You need to re browse the manual a little more carefully. Since you're from California I can understand your confusion however.

Jofu

HEY HEY HEY... Easy there, tiger

Geoff

wysokowski

Octane numbers are the same for all states. California doesn't calculate their own.

Mr. Toads

Leave 72 and sunny for choking humidity and 'skeeters the size of small craft -- no thanks!

That said, we do appreciate one less driver on the road and at the beach so good on ya!

RichieRichZ06

True, but most states have 93 octane and the max you can typically find at the pump here is 91 octane with 8-15% ethanol content.

New car dude

Go to the local airport fill gas cans with 110 and then mix it. Its a hassle but if its like Switzerland then you just pay the clerk and you have high octane gas .

ephelps98

Ah the joys of living in California

jbsblownc5

Most airport fuel is leaded, not good...

jbsblownc5

Pretty sure the fools out here in Ca calculate octane the same way as the rest of the country....

Pb82 Ronin

False. 2 octane points can usually grant an extra 2-3* of timing when tuning (application specific of course) which can equate to 15-20 HP in NA combos. Boosted cars can make another 15-20 per degree of timing. So octane very much matters.

jbsblownc5

I jumped on the dyno with straight 91 fuel in my 17 Z06, it made 481 RWHP, down at least 60 HP off what is should be. Sure, for those that don't need or use all the power their new corvette can make, they may not notice it. For me, I use every bit of the power and then some, so 60 RWHP loss is unacceptable!

AzDave47

In much of Utah, premium is only 90 octane.

Thinner air requires less octane (N/A), but you also lose a lot of power at altitude with a N/A engine. At Ely NV I figure I am down close to 20% from sea level.

Cirrus8

I have lived in Utah all of my 88 years and have never seen 90 octane. It has always been 87 or 91 octane.