What gas should you use?
Senior Member
Joined: 02-11-09
Posts: 1,394
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From: Detroit, MI
Running high octane in cars that do not require will give no benefit. If you want to run "cleaner" just run a fuel system cleaner in your tank if your that concerned about that.
High compression engines need higher octane fuels to prevent detonation. The higher the octane of fuel, the less likely it is to ignite until the piston in in the proper stage for ignition. Follow your owners manual...and it will state Premium fuel is "recommended". If you go w/ the stage kit...Premium fuel is "required". I would never run a boosted car w/o the highest possible octane I could get in my area, and make sure the tune is for that (if you get tuned other then GM). I've had issues going from having 93 octane in my Audi A4 to only getting 91 Octane when I relocated to CA, had to have the car retuned for the lower octane.
High compression engines need higher octane fuels to prevent detonation. The higher the octane of fuel, the less likely it is to ignite until the piston in in the proper stage for ignition. Follow your owners manual...and it will state Premium fuel is "recommended". If you go w/ the stage kit...Premium fuel is "required". I would never run a boosted car w/o the highest possible octane I could get in my area, and make sure the tune is for that (if you get tuned other then GM). I've had issues going from having 93 octane in my Audi A4 to only getting 91 Octane when I relocated to CA, had to have the car retuned for the lower octane.
But, run 93 octane in your SS/TC if you want max power due to how it was designed and tuned. Just don't expect the exhaust to be clean due to all the unburnt fuel! Notice how you get a pitch black deposit after 1 day of driving? Yeah, that's because of the 93 octane.
I run 87 octane in my 07 Mustang GT and the exhaust stays clean for thousands of miles. The Mustang owners that use 93 octane get the pitch black deposits in the exhaust asap.
The turbocharged direct injected engines are more flexible when it comes to octane, but expect a hit in power and MPG when you use 87 octane.
Bottom line: 91+ octane for SS/TC.
New Member
Joined: 05-20-09
Posts: 52
Likes: 0
From: Delaware
We have corn ethenol here. It contains one third less energy than gas, which means mileage is 30 to 40 percent lower.
I mostly do in town driving as yes I use regular and get 30mpg. I use to get about 22 then I switched my oil to Amsoil full syn and I have been getting 30 ever since.
Fuel pumps today are located within the gas tank and are cooled by the gasoline itself. While going under 1/4 tank gas the pump is not able to keep a cooler temp because the gas is lower. Over a period of time and going under 1/4 tank time and time again it will cause the fuel pump to go bad due to repeated overheating. In alot of cases there can be a prewarning. This sign is the gas guage not working or being off slighlty due to the sending unit being part of the fuel pump (in most cases).
To each his own, and everyone does things their own way. I am not trying to argue I was just sharing what I do personally. I will never buy another car (unless I have kids) and will drive this car til I am 90 (or they take my license away,lol) I work in an automotive garage as a service manager and I am the only one in my family that is not ASE certified. I grew up doing things a certain way. Some aren't good habbits but to me its no big deal. My fiance is a technical engineer from England and he does things different alot different to us aswell. We don't argue about it, we just do our own thing to our cars (I get him to do what I want to my car,lol)
I also don't like dexcool and flushed it out of my car and put the green glycol based anti-freeze back in it. Some people don't mind dexcool if its flushed out yearly, some drive it til the engine goes, some just use what they always have. I am not judging what people do, but when there is a thread asking about something specific about what people use I answered. I appreciate feedback, don't get me wrong, but I am not going to change what I do because anyone thinks their way is better.
I will get off my soapbox now,lol
I mostly do in town driving as yes I use regular and get 30mpg. I use to get about 22 then I switched my oil to Amsoil full syn and I have been getting 30 ever since.
Fuel pumps today are located within the gas tank and are cooled by the gasoline itself. While going under 1/4 tank gas the pump is not able to keep a cooler temp because the gas is lower. Over a period of time and going under 1/4 tank time and time again it will cause the fuel pump to go bad due to repeated overheating. In alot of cases there can be a prewarning. This sign is the gas guage not working or being off slighlty due to the sending unit being part of the fuel pump (in most cases).
To each his own, and everyone does things their own way. I am not trying to argue I was just sharing what I do personally. I will never buy another car (unless I have kids) and will drive this car til I am 90 (or they take my license away,lol) I work in an automotive garage as a service manager and I am the only one in my family that is not ASE certified. I grew up doing things a certain way. Some aren't good habbits but to me its no big deal. My fiance is a technical engineer from England and he does things different alot different to us aswell. We don't argue about it, we just do our own thing to our cars (I get him to do what I want to my car,lol)
I also don't like dexcool and flushed it out of my car and put the green glycol based anti-freeze back in it. Some people don't mind dexcool if its flushed out yearly, some drive it til the engine goes, some just use what they always have. I am not judging what people do, but when there is a thread asking about something specific about what people use I answered. I appreciate feedback, don't get me wrong, but I am not going to change what I do because anyone thinks their way is better.
I will get off my soapbox now,lol
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Sep 26, 2015 12:16 PM