habib

I was told that the car was designed for Regular gas. Is it ok to use Regular or best to use Premium gas. The way the gas prices are is insane. I appreciate the feedback, dennis

talon90

FWIW, I only use premium in my car. Period.

To answer your question, From the owners manual:

Fuel
Use of the recommended fuel is an important part of the
proper maintenance of your vehicle.

Gasoline Octane
Use premium unleaded gasoline with a posted octane of
91 or higher for best performance. You may also use
middle grade or regular unleaded gasoline rated at 87
octane or higher, but your vehicle’s acceleration may be
slightly reduced. If the octane is less than 87, you may
get a heavy knocking noise when you drive. If this occurs,
use a gasoline rated at 87 octane or higher as soon as
possible. Otherwise, you might damage your engine.

Gasoline Specifications
It is recommended that gasoline meet specifications
which were developed by automobile manufacturers
around the world and contained in the World-Wide Fuel
Charter which is available from the Alliance of Automobile
Manufacturers at www.autoalliance.org/fuel_charter.htm.
Gasoline meeting these specifications could provide
improved driveability and emission control system
performance compared to other gasoline.


Notice: Your vehicle was not designed for fuel that
contains methanol. Do not use fuel containing
methanol. It can corrode metal parts in your fuel
system and also damage the plastic and rubber
parts. That damage would not be covered under
your warranty.

lagogarda

premium.

Another Yellow

Percent wise, premium has never been cheaper. When regular was $1.29, premium was 20 cents more at $1.49. That's 16% higher. Now with regular at $3.19 a gallon and premium still 20 cents more at $3.39 the percent difference is only 6%.

fts

Premium for mine.

Landru

I tried burning a few tanks of Amoco/BP "Silver" 87 octane in my 2006.
Where I live regular and "Silver" both have 15% ethenol while "Gold" 92 octane has none, a'tall.

The difference in mileage between the two was like night & day.
Was throwing money away using the 87 octane w/ the ethenol as opposed to the Gold 92, fact.

While my car was having an oil change (yesterday) at the dealer I asked the service manager (smart, knowledgeable guy) about mileage & ethanol blends.
He just shook his head confirming what I'd already learned.

Long & short is I'll no longer be penny wise & dollar foolish when it comes to what gasoline for my LS2.
Buying twice as much cheap fuel to go half as far doesn't add up to any savings in my book.

MaNiFeSt

its a performance vehicle, with a performance engine. nothing but premium goes into my car. i didnt even have to give it a second thought. the second i bought the car and began filling it up, i just went for the best gas that was available at that time.

TonyC6Go

Huh? Yes, but 20 cents when gas was $1.29 is still 20 cents when gas is now $3.39. 20 cents is 20 cents regardless.

vetdude

Premium. The difference of $3-$4 per tank isn't worth the decreased performance or cleaning properties of using regular.

LS WON

Maybe you should consider an economy car instead.

Smith13

Yes but 20 cents in a vette only adds up to 3 bucks per fill up. I do believe that it is a 15 gallon gas tank on my vette. So what is 3 bucks per fill up when you spent 45000-50000 thousand on your vehicle?

TonyC6Go

Performance vehicle, yes. If I was racing this on the track all the time, I would agree with higher octane...but when the owner's manual calls for 87, I use that. I've had 2 C5's and now a C6, and with my C5's, 99% of the time I used 87 octane and has zero problems and I was getting way above the average MPG (avg 30 MPG on highway, avg 24 MPG in semi-city driving) - and each car had over 65K miles on them when I sold them. I had no knocks, pings, rattles or any other things people claim they hear when they run lower grade in their car. I just used what the owner's manual called for, and I had no problems.

So unless I feel like spending an extra buck or two, if I catch a good deal on mid-grade or premium, I'll spring for it. Otherwise, I'll keep running 87 octane.

johnodrake

Color me stupid, but why do people with $60K cars worry about .20 cents a gal or 3-4 bucks a fill? I just don't get it.

bocabob

I use priemum... here is my thought. It is better better fuel number one. Number 2, say you use 1000 gallons a year (80 gallons a month, 20 gallons a week)... If you are paying 25 cents more a gallon for premium 91 octane, that would be ONLY another $250 per year in fuel over the 87 octane. ($20 bucks a month)



My Vette is worth it.

jogar80

I use premium ONLY. Even though my eyes almost fall out the sockets as I watch the numbers roll up on the pump, its premium only. I have a friend who's car has fewer miles than mine. He has always put regular in it and now the thing has started to shake a lil more than is normal. He was pretty surprised when I told him 91 octane or better is recommended, said he didnt know. He has switched now and we'll have to see if the problem goes away with the fuel change.

BigJoe

I've been using regular in mine for the past 2000 miles or so (5 or 6 tanks full) and I see no difference in performance or MPG. I feel no shaking or misfires at any speed or at idle and I get about the same or maybe even 1-2 mpg better. Of course it's a daily driver, not a racer. I'm sure I sacrifice 5-10% power, but I still have more than enough to get me to work every day. And its not the money, but the principle for me. Anything I can do to keep $$$ out of big oil's pockets and in mine I do.

Hoonose

Because that's exactly the reason why many can afford the $60K now.

The fact of the matter is that 87 octane will not harm your motor.
The fact of the matter is that you are giving up only 10-15 PEAK horsepower by using the lower octane, as compared to 93 octane.
The fact of the matter is that most driving is done in the 2-4000rpm range, and the loss in HP would be way less than 10-15 HP.
10-15 HP probably cannot be felt in the seat of your pants, especially with TC. 10-15 HP isn't good enough for even one more MPH at the top end!
Using 93 octane in your C6 is more a state of mind than anything.
Unless you are racing on a track it will have a very minimum impact on the car's performance, a slight impact on your money, and probably the most impact on your mind.
That being said, I always use 93 octane in mine. 4 gallons of 100 no lead + 14 gallons of 91 octane = 16 gallons of 93 octane at fill up time.

Low12s

It will run on any grade, but premium will obviously give you the best performance.

Hoonose

5-10% power is loss of 17-35 RWHP.
Previous posts showed more like 10-15 RWHP loss on the dyno.

Low Rider

Like the idea of not supporting Big Oil but just can't make myself put regular gas in my Vette.