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- #41
Great for the driver. The passenger not so much. Or so I have been told lol...
Went for an Excursion..
- Thread starter Jack Raccoon!
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Get their own car? lol..
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- #43
Get a Lawyer. Please...
Me neither. I avoid 93 0r 94 octane. Higher octane is achieved by adding more ethanol and does not equal higher performance or less buildup in an engine. Our cars don't require that high an octane level and I'm not an ethanol fan for anything. Unfortunately it's getting harder and harder to find fuel without ethanol.
Unfortunately the manual says this.
Fuel
Unleaded gasoline, rated at 93 octane or higher, is required.
However there is a caveat
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.
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- #46
5 years in using 91. Bet I haven't put more than 10 tanks of 93 or higher in the tank...
From what I’ve found doing a bit of research, at least with Shell gasoline which I use, both their 91 and 93 octane gas have the same 10% ethanol content as required by law. Both are TopTier . Blame the eco radicals for that. Among other hairbrained regulations……for what it’s worth there does seem to be some difference between the recommendations for the LT1 vs the LT2 ….
The recommended octane rating for the engine in the C7 Corvette, specifically the LT1 6.2L engine (Stingray), is 93 octane for optimal performance and fuel economy. While the engine can run on lower octane fuel such as 87 or 91 in emergencies or lower altitude areas, using less than 93 octane may lead to reduced acceleration, fuel economy, and potential engine knocking. Prolonged use of fuel below 93 octane could cause engine damage and void warranty coverage. The higher 93 octane rating is not strictly required but strongly recommended by Chevrolet for best performance and engine protection.
For supercharged LT4 (Z06) and LT5 (ZR1) engines, 93 octane is required, with 100 octane or higher recommended under track conditions or high temperatures.
In summary:
• C7 Stingray (LT1): 93 octane recommended, 87 octane can be used temporarily but not ideal.
• C7 Z06 (LT4) and ZR1 (LT5): 93 octane required, higher octane recommended for high-performance conditions.
Using top-tier fuel brands also helps ensure fuel quality, regardless of octane.
The recommended octane rating for the C8 Corvette is 91 or higher, with 93 octane being preferred for optimal performance. The owner’s manual specifies 91 octane as the minimum required, but using 93 octane can enhance performance and engine protection. Using lower octane fuel than 91 is generally not advised except in emergencies and may cause reduced performance due to engine timing adjustments that the ECM makes to protect the engine.
In summary:
• Minimum recommended octane: 91
• Preferred octane for best performance: 93 or higher
This matches Chevrolet’s guidance and owner experiences indicating the C8 runs well and safely on premium 91 or above octane fuel.
Fuel Use of the recommended fuel is an important part of the proper maintenance of this vehicle. When driving in the U.S. and Canada, to help keep the engine clean and maintain optimum vehicle performance, we recommend TOP TIER Detergent Gasolines. See www.toptiergas.com for a list of TOP TIER Detergent Gasolines. If equipped with the LT1 engine, use premium unleaded gasoline meeting ASTM specification D4814 with a Use of Seasonal Fuels posted octane rating of 91 or higher. Regular unleaded gasoline rated at 87 octane or higher can be used, but acceleration and fuel economy will be reduced, and an audible knocking noise may be heard. If this occurs, use a gasoline rated at 91 octane or higher as soon as possible. Otherwise, the engine could be damaged. If heavy knocking is heard when using gasoline with a 91 octane rating or higher, the engine needs service. If equipped with the LT4 supercharged engine, use premium unleaded gasoline meeting ASTM specification D4814 with a posted octane rating of 91 or higher. If the octane is less than 91, damage to the engine may occur and may void the vehicle warranty. If heavy knocking is heard when using gasoline rated at 91 octane or higher, the engine needs service.
Not sure where you did your research but this is straight out of the C7 owner's manual. You'd think they would know. If the opportunity arises that I want to take a run over to the Autobahn and exceed the C7's spec top speed of 292 Kph, I might consider a higher octane. Out of interest, my C6 with only 430 hp had a spec top speed of 306 Kph. As far as fuel economy goes, my best 100km average on a 2500 km trip to Vancouver was 7.2 litres. My Vette has never been in Eco mode and since it's an M7, it doesn't switch unless it's in Eco.
Seems to be essentially the exact same as what I found. I may be missing something but fail to see the difference……it does say that 93 is not strictly required but recommended for the LT1 . Which could be said for the LT2 as well. My understanding of it is use 91 in either and 93 if so desired and if it’s available. And of course top tier which should be used in every ICE . I have no idea but could you be getting pre ignition and not hear it ? I have heard engines knocking hard because of it but it’s dead obvious . It also seems to vary somewhat depending on which year of manual regarding the LT1 . Refer to the last paragraph of this post….
The recommended octane rating for the GM LT1 engine generally is 91 octane or higher. More specifically, while 91 octane is often cited as the minimum required, manufacturer manuals and user experiences from recent years indicate that using 93 octane fuel is highly recommended for optimal performance and engine protection. The LT1 can operate on lower octanes such as 87, but this may reduce performance and cause timing to be retarded to avoid knock. The knock sensors are very sensitive to detect lower octane fuel effects, which mostly impacts performance rather than causing immediate engine damage.
Summary of key points:
• Owner’s manuals for many LT1-equipped cars recommend 91 octane minimum, with 93 octane recommended for best performance.
• Early manuals accepted 87 octane but strongly recommend 91 or higher. More recent manuals and real-world usage highly recommend 93 octane especially for performance cars like the Corvette Stingray.
• Running lower than recommended octane can result in knock retard (timing pull), reducing power and possibly fuel economy, but modern engine management systems protect the engine.
• Some users report little felt difference running 91 versus 93 octane for street use but prefer 93 when available.
In summary, for the GM LT1 engine, 93 octane is the recommended octane rating for optimal performance and engine health, with a minimum usable rating typically at 91 octane according to the latest manuals and community experience. Lower octane can be used but may compromise performance.
This post is probably too long already but what the heck. This refers to GM changing the guidance in subsequent manuals for the engine.
C7 Fuel Recommendations: There's a little known fact that GM has changed the Owner's Manual verbiage for fuel requirements for all C7 Corvettes several times throughout the model run. The 2014 Owner's Manual requires using gasoline with a posted octane rating of 91 for all models. For 2015, this changed to a minimum posted rating of 87 octane as acceptable and 91 octane recommended for all LT1-equipped cars (Stingray), and required 91 octane for all LT4-equipped cars (Z06). 2017 manuals indicate LT1-equipped cars are highly recommended to use 93 octane fuel, but can use as low as 87, with LT4-equipped cars to use 93 octane where possible, and 91 where 93 is not available. For 2019 this has changed to 87 octane as acceptable with 93 recommended for LT1-equipped cars (Stingray & Grand Sport), and 93 required for LT4- and LT5-equipped cars (Z06 & ZR1). Other model year manuals likley have additional verbage differences. Ultimately, it is strongly suggested to use the highest octane rating available at every fill-up in your Corvette for best performance and protection against engine damage. The few dollars you might save at the pump has the potential for very costly repairs down the road, and in some cases can void your warranty (this is explicitly stated in the sampled Owner's Manuals).
The recommended octane rating for the GM LT1 engine generally is 91 octane or higher. More specifically, while 91 octane is often cited as the minimum required, manufacturer manuals and user experiences from recent years indicate that using 93 octane fuel is highly recommended for optimal performance and engine protection. The LT1 can operate on lower octanes such as 87, but this may reduce performance and cause timing to be retarded to avoid knock. The knock sensors are very sensitive to detect lower octane fuel effects, which mostly impacts performance rather than causing immediate engine damage.
Summary of key points:
• Owner’s manuals for many LT1-equipped cars recommend 91 octane minimum, with 93 octane recommended for best performance.
• Early manuals accepted 87 octane but strongly recommend 91 or higher. More recent manuals and real-world usage highly recommend 93 octane especially for performance cars like the Corvette Stingray.
• Running lower than recommended octane can result in knock retard (timing pull), reducing power and possibly fuel economy, but modern engine management systems protect the engine.
• Some users report little felt difference running 91 versus 93 octane for street use but prefer 93 when available.
In summary, for the GM LT1 engine, 93 octane is the recommended octane rating for optimal performance and engine health, with a minimum usable rating typically at 91 octane according to the latest manuals and community experience. Lower octane can be used but may compromise performance.
This post is probably too long already but what the heck. This refers to GM changing the guidance in subsequent manuals for the engine.
C7 Fuel Recommendations: There's a little known fact that GM has changed the Owner's Manual verbiage for fuel requirements for all C7 Corvettes several times throughout the model run. The 2014 Owner's Manual requires using gasoline with a posted octane rating of 91 for all models. For 2015, this changed to a minimum posted rating of 87 octane as acceptable and 91 octane recommended for all LT1-equipped cars (Stingray), and required 91 octane for all LT4-equipped cars (Z06). 2017 manuals indicate LT1-equipped cars are highly recommended to use 93 octane fuel, but can use as low as 87, with LT4-equipped cars to use 93 octane where possible, and 91 where 93 is not available. For 2019 this has changed to 87 octane as acceptable with 93 recommended for LT1-equipped cars (Stingray & Grand Sport), and 93 required for LT4- and LT5-equipped cars (Z06 & ZR1). Other model year manuals likley have additional verbage differences. Ultimately, it is strongly suggested to use the highest octane rating available at every fill-up in your Corvette for best performance and protection against engine damage. The few dollars you might save at the pump has the potential for very costly repairs down the road, and in some cases can void your warranty (this is explicitly stated in the sampled Owner's Manuals).
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- #50
All this information would be great in a Tech Thread, not in a thread where I'm trying to gain some positive attention instead of the hate that I usually draw lol...
Hmmm….just trying to help.
We do care . If you are experiencing feelings of persecution, here are some steps you can take to manage them and seek help:
1. Recognize the Feelings
• Acknowledge that your feelings are valid and real, even if they are distressing.
• Try to notice patterns or triggers that worsen these feelings.
2. Seek Professional Support
• Consider reaching out to a mental health professional such as a psychologist, psychiatrist, or counselor.
• A professional can help differentiate between feelings rooted in real experiences (like bullying or discrimination) and those that may be linked to mental health conditions such as anxiety, paranoia, or psychotic disorders.
3. Use Coping Strategies
• Practice grounding techniques, mindfulness, or relaxation exercises to manage anxiety and stress.
• Keep a journal to track thoughts and emotions, which can help you identify any distortions in thinking.
• Reach out to trusted friends or family members for support and perspective.
4. Educate Yourself
• Learn about mental health conditions that can cause feelings of persecution (like paranoia, delusional disorder, and schizophrenia).
• Understanding these conditions can help reduce stigma and make it easier to seek appropriate help.
5. Create a Support Network
• Stay connected with people you trust and who provide a sense of safety.
• Support groups (online or in-person) for anxiety, depression, or psychosis can provide community and understanding.
6. When to Seek Immediate Help
• If your feelings are causing significant distress, harmful thoughts, or seriously impacting your life, seek help promptly.
• If you or someone you know is at risk of self-harm or harm to others, contact emergency services or a mental health crisis line immediately.
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- #52
After reading that, I feel like I should just jump already lol...
At least you can take a joke. Good sign , lol.
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- #54
I have one leg back inside the window frame now...
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- #55
Ok, new exit plan. A week Saturday I'm going to drive up to the Ux, roll my car in front of a "Mods" house and have it burst into flames. When people drive by they will say "Oh, that must be where Murray's Car-B-Q is"...
I can give you some pointers on rolling a car.
I did a google street view search of your address....It's only a 4 foot drop....
We could all chip in on a ladder ………
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- #59
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- #60
