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Old 03-14-2013, 05:57 PM
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Fuel Requirement GC 2014 V8 owners

Any of you are using unleaded regular 87 octane on the V8?

Or should I use only 89 octane?

I know that the spec says it is acceptable 87 and 89 is recommended ... but what are the implications ???

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Old 03-14-2013, 07:27 PM
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Re: Fuel Requirement GC 2014 V8 owners

Slightly less hp are the implications. The vehicle is smart enough to sense that it has 87 in it, and will pulling timing back to compensate. This yields a slight (15ish?) loss in hp.

People will tell you that its better to use 89 long term for a variety of (mostly bogus) reasons. Keep in mind, the Hemi is also a work truck engine, and can run for hundreds of thousands of miles on 87.

Sometimes I feel like I get slightly better fuel economy using 89. It may be a psychological thing though.
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Old 03-14-2013, 08:54 PM
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Re: Fuel Requirement GC 2014 V8 owners

While I'm driving a MY12, the specifications are the same. I run 87. The place I buy most of my gas (Costco) doesn't even sell 89. I've not had any performance issues and get good fuel economy.
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Old 03-14-2013, 09:04 PM
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Re: Fuel Requirement GC 2014 V8 owners

As long as it is reputable fuel (ie: NOT the podunk Discount Gas Mart) it's fine. I would suggest using 89 if you are towing anything of significance.
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Old 03-14-2013, 09:16 PM
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Re: Fuel Requirement GC 2014 V8 owners

Thanks for sharing!!!

Nice to know that you guys had no problems using 87 octane! That's what I'm planning to do!

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Old 03-14-2013, 10:08 PM
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Re: Fuel Requirement GC 2014 V8 owners

I definitely do get better mpg's with 89, between 1 and 2 more mpg's when using 89. I only do Shell and at least here in southeast Ontario 87 has up to 10% ethanol, 89 up to 5% ethanol, and 91 0% ethanol. I guess the difference has to do with the ethanol %.
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Old 03-15-2013, 01:15 PM
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Re: Fuel Requirement GC 2014 V8 owners

That makes sense, nvfusa...Ethanol unfortunately lowers fuel economy. I don't know what the blend is around here as the pumps just have stickers that say "up to 10% Ethanol" on them.
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Old 03-15-2013, 01:26 PM
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Re: Fuel Requirement GC 2014 V8 owners

I bought gas for my Jeep for the first time today. I was happy buying 89 for my Hemi, coming from a vehicle that needed 93.

Using 87 won't hurt anything, but the computer will retard the timing to prevent pinging. This will reduce performance and mileage. Whether it's a noticeable amount is any body's guess.
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Old 03-21-2013, 08:41 AM
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Re: Fuel Requirement GC 2014 V8 owners

Quote:
Originally Posted by Jim_in_PA View Post
While I'm driving a MY12, the specifications are the same. I run 87. The place I buy most of my gas (Costco) doesn't even sell 89. I've not had any performance issues and get good fuel economy.
I also fuel at Costco, will it hurt the engine if I only use 91 octane? I have a 2014 Hemi, and will be fueling today for the first time

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Old 03-21-2013, 08:43 AM
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Re: Fuel Requirement GC 2014 V8 owners

Hi,

no, the more octane the better the engine will run and the less it will consume
as the fuel efficiency is getting better.

so, your engine will say, thank you.
here we only have 91 to 100 octane gas in europe.
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Old 03-21-2013, 08:47 AM
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Re: Fuel Requirement GC 2014 V8 owners

Quote:
Originally Posted by SunShine31x View Post
Hi,

no, the more octane the better the engine will run and the less it will consume
as the fuel efficiency is getting better.

so, your engine will say, thank you.
here we only have 91 to 100 octane gas in europe.
Thanks!
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Old 03-21-2013, 08:49 AM
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Re: Fuel Requirement GC 2014 V8 owners

Quote:
Originally Posted by SunShine31x View Post
Hi,

no, the more octane the better the engine will run and the less it will consume
as the fuel efficiency is getting better.

so, your engine will say, thank you.
here we only have 91 to 100 octane gas in europe.
Completely and utterly false. The only way that would be true is if the timing can be advanced to take advantage of the increased octane, if the timing isn't increased you are not doing your engine any favors.

As a example, I run 87 octane in my fusion every time, a few months after I bought it I decided to try 91 octane to see if it would help anything. To this day that is the worst fuel economy I have ever seen out of that car. I went from getting 26ish to 22-23.
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