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  #25  
Old 10-03-2012, 01:34 PM
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Re: What grade of fuel do you use?

If you have a 5.7 liter and are running 87 octane, you may see an improvement in fuel economy and power by using the recommended 89 octane. It may be enough to offset the increased cost of 89 octane.

If I had a 5.7 running 87 and wanted to switch over to 89 I would run the tank as low as safely possible and fill up with 93 octane the first time since there will be at least a couple of gallons of 87 still in the tank. Then you can use 89 from there on out.
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  #26  
Old 10-08-2012, 09:05 PM
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Re: What grade of fuel do you use?

Alright tried mid grade (89) on Sunday on a 2.5 hour road trip my v6 has the pep and take off of the v8 jeeps i test drove, gas mileage stayed the same at 24-26 mpg hwy even in the WV hills, i see about 17-20 city.
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  #27  
Old 10-09-2012, 05:49 AM
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Re: What grade of fuel do you use?

Tried both and saw zero difference in gas mileage. Never really expected it because octane really adds no BTU's to the fuel. I do use 89 when I tow so I get the antiknock benefit. I run 87 the rest of the time and have had no regret.
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  #28  
Old 10-09-2012, 07:38 AM
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Re: What grade of fuel do you use?

Man this is crazy...I remember the days when all I would put in the car was Sunco 94 oct...It was like a $1.50 a gal. It didn't mater what the owners manual said you would just put in the best gas available. Plus cars were so simple you didn't even read the owners manual unless a warning light came on...lol
I don't think any1 even used the 87 oct which was like 0.99 cent.
You could full up for around $20.00 and it lasted you for 2 weeks.
I'm talking V8 engines...in my case a 87 Firebird Formula....OK I'm showing my age!
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  #29  
Old 10-09-2012, 07:50 AM
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Re: What grade of fuel do you use?

Before electronics started adjusting timing based on sensor readings, the one thing that determined octane requirement was compression ratio. Using higher octane than required made the driver feel better, but did nothing for the engine.

If carbon built up in the heads on an older car it could slightly increase the ratio, requiring a higher octane.

Some gas companies would advertise that their more expensive gas had additives to keep your engine clean. This was true. They didn't mention that the lower octane gas had pretty much the same things.

Marketing is a real money maker.
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  #30  
Old 10-09-2012, 08:50 AM
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Re: What grade of fuel do you use?

87. Doesnt need any higher than that.
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  #31  
Old 10-09-2012, 09:19 AM
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Re: What grade of fuel do you use?

My 67 Camaro ran fine on Sunoco 260 (24c/gal) but needed the timing bumped about 4 degrees.The Flex-Fuel (E85 is about 102 octane equiv) probably can use a higher octane than the V8.

One of the few mentions of the V6 head issues was "bad gas" so using 89 under load (towing) is probably not a bad idea.
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  #32  
Old 10-09-2012, 09:33 AM
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Re: What grade of fuel do you use?

Quote:
Originally Posted by Fredg369 View Post
Man this is crazy...I remember the days when all I would put in the car was Sunco 94 oct...It was like a $1.50 a gal. It didn't mater what the owners manual said you would just put in the best gas available. Plus cars were so simple you didn't even read the owners manual unless a warning light came on...lol
I don't think any1 even used the 87 oct which was like 0.99 cent.
You could full up for around $20.00 and it lasted you for 2 weeks.
I'm talking V8 engines...in my case a 87 Firebird Formula....OK I'm showing my age!
This is the problem with calling it 'Premium'. It is no more premium than regular, just has a higher octane.

I had just turned 16 right before prices began their upward trend, but I still remember when it was $.75. I actually remember rolling into the station on fumes and putting in $.75 worth because that's all the change I had.
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  #33  
Old 10-09-2012, 01:24 PM
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Re: What grade of fuel do you use?

87 most of the time. If I find cheap 89, around the same price as 87 elsewhere, i'll put in 89.
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  #34  
Old 10-09-2012, 06:17 PM
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Re: What grade of fuel do you use?

87. No issues of any kind. I don't feel the need to buy the more expensive 89 octane fuel.
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  #35  
Old 10-10-2012, 08:51 PM
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  #36  
Old 10-11-2012, 10:01 AM
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Re: What grade of fuel do you use?

Speaking of cheap gas, if only that was true today!

I just filled my Wk2 with 91 oct yesterday.. Gas here in Socal is 4.93/gal. Thats the cheapest place within a 15 mile radius.
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