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Old 06-10-2011, 05:26 PM
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Type of fuel?

Hi all,
I have a 5.7 V8. Just wondering what type of gas you guys have been fueling with. I have been fueling with 89. Any feedback would be appreciated!
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Old 06-10-2011, 06:02 PM
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89 is recommended. I use 89 mostly.
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Old 06-10-2011, 06:03 PM
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I wouldn't use 93.....
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Old 06-10-2011, 07:06 PM
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Re: Type of fuel?

I've been using 87 octane since new.....12,000km / 8 months without any problems. Manual says 87 is acceptable but do what you feel comfortable doing.

Gas is $1.30/liter or $5.00/gal here.

NB. My previous Jeep GC Overland, V8 4.7L HO ran on regular gas for the 8 years, 120,000km without a hiccup. That manual called for premium gas for max power but also stated that regular may be used with resulting less power.
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Old 06-10-2011, 07:36 PM
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Re: Type of fuel?

I always use mid-grade (89) octane fuel. I chose to buy a Hemi for performance, and don't want to compromise the performance by using 87 octane fuel.
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Old 06-10-2011, 08:17 PM
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Re: Type of fuel?

I also use 87 octane. I don't see any point in spending extra money on 89 if the engine doesn't knock.
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Old 06-10-2011, 09:58 PM
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These guys are right, 87 will do, but for 5 or 6 extra bucks why not go 89? That's how I look at it. We're already getting murdered at the gas pump, what difference does 5 bucks make? 93 is no good for the hemi from what I've read on this forum so I stay away from that altogether and I have used 87 from time to time but I normally go 89, as I did today. I just love filling up and seeing 80 bucks on the gas pump. Damn the Saudis are getting obscenely rich. Oh well my hemi loves 89 so 89 it gets.....
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Old 06-10-2011, 10:04 PM
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Re: Type of fuel?

The engine won't knock with 87 only because it will automatically pull the timing to limit early detonation...is it bad for the engine in the long run, probably not, but 89 is the recommended grade to achieve full compression and power from the engine. As far as MPG's are concerned you may see a slight improvement with the higher grade which would help offset the initial cost at the pump. Above 89 you aren't helping the engine at all so it is truely a waste of money IMO.
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Old 06-11-2011, 01:19 AM
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Re: Type of fuel?

Quote:
Originally Posted by berk483 View Post
The engine won't knock with 87 only because it will automatically pull the timing to limit early detonation...is it bad for the engine in the long run, probably not, but 89 is the recommended grade to achieve full compression and power from the engine. As far as MPG's are concerned you may see a slight improvement with the higher grade which would help offset the initial cost at the pump. Above 89 you aren't helping the engine at all so it is truely a waste of money IMO.
Yep...you are 100% correct. Great post!

In my 2005 GC Hemi I later switched to the 89 and soon realized a noticeable performance improvement after using 87 for almost 5 years...in hindsight wished I had used 89 earlier. So, my new Hemi Summit only gets 89...great performance. I don't just want "acceptable"...I want performance and a bit better mpg that goes with it. 89 all the way...
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