Premium fuel
Race Director
Joined: Jul 2000
Posts: 10,786
Likes: 199
How many times do you think I've had the fuel door open during the last 34,000 miles I've driven my 09 Z06? What's your point?
Where does it say anything different than what I posted?
Oh, and the owner's manual goes into additional detail as what fuel is required in my Z06, as it does for the base C6 and the ZR1, as well as it does in the owners manual for the 2014 C7. How many times have you looked at the owners manual that is in the glove box of my Z06?
BTW, the sticker on the inside of my fuel door does not say "Use what ever gasoline that the Corvette forum tells you to use." and I doubt it says that on the inside of the fuel door on the C7.
Where does it say anything different than what I posted?
Oh, and the owner's manual goes into additional detail as what fuel is required in my Z06, as it does for the base C6 and the ZR1, as well as it does in the owners manual for the 2014 C7. How many times have you looked at the owners manual that is in the glove box of my Z06?
BTW, the sticker on the inside of my fuel door does not say "Use what ever gasoline that the Corvette forum tells you to use." and I doubt it says that on the inside of the fuel door on the C7.
We are on a C7 forum talking about a C7.
Race Director
Joined: Sep 2013
Posts: 11,825
Likes: 2,477
From: Ft Lauderdale
Tech Contributor
Premium fuel recommended is pretty much the industry std these days per the legal depts.. If they said required, you'd have people freakin out when they could not find it, and sitting on the side of the road being too literal. So it is "recommended" but what they all mean is "this car is tuned and made for premium fuel, use less when only in a pinch" It does not mean run 87 as a practice.
Moderator
Joined: Feb 2006
Posts: 39,134
Likes: 17,985
From: DFW Area TX
Use premium unleaded gasoline
with a posted octane rating of 91 or
higher. If the octane is less than 91,
you could damage the engine and
may void your vehicle warranty.
with a posted octane rating of 91 or
higher. If the octane is less than 91,
you could damage the engine and
may void your vehicle warranty.
So, follow the Owners Manual which was written specifically for the C7, or follow a generic sticker on the gas door? I'll follow the Owners Manual.
Race Director
Joined: Jul 2000
Posts: 10,786
Likes: 199
Premium fuel recommended is pretty much the industry std these days per the legal depts.. If they said required, you'd have people freakin out when they could not find it, and sitting on the side of the road being too literal. So it is "recommended" but what they all mean is "this car is tuned and made for premium fuel, use less when only in a pinch" It does not mean run 87 as a practice.
Team Owner
Joined: Sep 1999
Posts: 41,732
Likes: 1,718
From: Springfield MO
"Use premium unleaded gasoline with a posted octane rating of 91 or higher. If the octane is less than 91, you could damage the engine and may void your vehicle warranty. If heavy knocking is heard when using gasoline rated at 91 octane or higher, the engine needs service." It says use(that means it is REQUIRED") and it says if you use gasoline that is below 91 octane, you could damage the engine. Is that so hard to understand?
Premium fuel is REQUIRED for the C7. GM does not say it is okay to use any gasoline that has a posted octane of less than 91. In fact they warn you that if you do use a gasoline with a posted octane rating below 91, you could damage the engine and you could void your warranty. Is that clear enough for you?
Last edited by JoesC5; Jul 9, 2014 at 11:12 PM.
Le Mans Master
Joined: Oct 2007
Posts: 8,396
Likes: 15
Direct injection on the new engines means they can run a higher compression ratio - 11.5:1 in the LT1 vs 10.7:1 in the LS3. I wouldn't risk running 87 octane on a regular basis in that engine. Typically the cost of premium fuel is $.30/gallon more than regular. The cost is negligible, especially when you consider the cost of the car itself.
Last edited by jcosta79; Jul 9, 2014 at 11:15 PM.
Team Owner
Joined: Sep 1999
Posts: 41,732
Likes: 1,718
From: Springfield MO
Premium fuel recommended is pretty much the industry std these days per the legal depts.. If they said required, you'd have people freakin out when they could not find it, and sitting on the side of the road being too literal. So it is "recommended" but what they all mean is "this car is tuned and made for premium fuel, use less when only in a pinch" It does not mean run 87 as a practice.
Race Director
Joined: Jul 2000
Posts: 10,786
Likes: 199
And if you own a C7, then you should read your owners manual where it says, on page 9-51...
"Use premium unleaded gasoline with a posted octane rating of 91 or higher. If the octane is less than 91, you could damage the engine and may void your vehicle warranty. If heavy knocking is heard when using gasoline rated at 91 octane or higher, the engine needs service." It says use(that means it is REQUIRED") and it says if you use gasoline that is below 91 octane, you could damage the engine. Is that so hard to understand?
Premium fuel is REQUIRED for the C7. GM does not say it is okay to use any gasoline that has a posted octane of less than 91. In fact they warn you that if you do use a gasoline with a posted octane rating below 91, you could damage the engine and you could void your warranty. Is that clear enough for you?
"Use premium unleaded gasoline with a posted octane rating of 91 or higher. If the octane is less than 91, you could damage the engine and may void your vehicle warranty. If heavy knocking is heard when using gasoline rated at 91 octane or higher, the engine needs service." It says use(that means it is REQUIRED") and it says if you use gasoline that is below 91 octane, you could damage the engine. Is that so hard to understand?
Premium fuel is REQUIRED for the C7. GM does not say it is okay to use any gasoline that has a posted octane of less than 91. In fact they warn you that if you do use a gasoline with a posted octane rating below 91, you could damage the engine and you could void your warranty. Is that clear enough for you?
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Team Owner
Joined: Sep 1999
Posts: 41,732
Likes: 1,718
From: Springfield MO
Is that your definition of 'recommended' or what? I trust that the engineers did quite a lot of testing to make sure the fuel mapping was finalized properly when running fuels with less than 'Premium' octane levels. Even though you are pumping what you think is Premium from any pump, how do you know it actually is? The 87 has likely been tested sufficiently to determine there is no problem running it. As I said before, even Gm can't decide what to say because what is written in the manual and on the fuel door label are different.
Drifting
Joined: Oct 2011
Posts: 1,299
Likes: 79
From: Wichita Kansas
I am leaving on 8000 mile around the USA trip next week. I researched availability of premium fuel along my route. Vast stretches of state highways through Utah and Wyoming have no premium fuel available. I am concerned due to the extreme elevation climbs I will make across great divide and in Yellowstone park. I'm sure the car has knock sensor but if I use regular fuel and keep my foot out of it will I be OK? Would anyone recommend an octane booster to take along with me and would that help?
Melting Slicks
Joined: Dec 2009
Posts: 3,213
Likes: 17
but if you do want a o. boost use 104 you can buy it in just about any auto store and you ''can '' feel the diff. have a safe trip
Team Owner
Joined: Sep 2005
Posts: 29,113
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From: Big Bend Country, TX
St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15- '16-'17-‘18-‘19-'20-'21
NCM Lifetime Member
Did you notice the date of the original post ? The o/p made the trip over two months ago !