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  #13  
Old 11-29-2014, 07:11 PM
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Re: For 5.7L HEMI: what octane rating of gas do you use?

I use 91 at Costco since they don't have 89 at the pump.

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  #14  
Old 11-29-2014, 07:13 PM
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Re: For 5.7L HEMI: what octane rating of gas do you use?

The only time I ever put 87 octane in is if it has no ethanol. If 10% ethanol is involved, it is always 91. I know 91 has no benefits over 89 octane normally (unless your engine is tuned for it with a programmer, of course), but when you throw 10% garbage in, it seems to like the higher octanes a little better.
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Old 11-29-2014, 09:27 PM
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Re: For 5.7L HEMI: what octane rating of gas do you use?

OK - This is my 6th GC and the 5th with the big V8.

I used 87 in my 2005 V8 Hemi until the last about 3 months of ownership I switched to 89...and yes I DID notice better performance. It was noticeable after driving it with 87 for 5 years.

Sooooo, for my 2011 and 2014 GC's I only use 89. It is what is recommended for best performance and based on my 2005 experience, I agree.

With respect to Costco, dunno why they don't have the mid-grade (or allow to mix). I have a few times put about 1/2 at 87 and 1/2 at 89 in at Costco but is a bit of a pain as you gotta guess how much is in the first half and make it two transactions. SUPPOSEDLY, the 91 runs hotter.....dunno how true that is, perhaps someone can shed light on that. Anyway, I am sticking to what he manufacturer recommends, 89!
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Old 11-29-2014, 09:47 PM
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I use 91 and 94 when availlable.
If price is too high i then fill with 89.
I really notice a huge difference in performance and mpg going from 87 to 91.
Mine gains 2 to 3mpg. So i think it is worth it.

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  #17  
Old 11-30-2014, 02:12 AM
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Re: For 5.7L HEMI: what octane rating of gas do you use?

Nothing less than 98 here downunder
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Old 11-30-2014, 02:20 AM
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Re: For 5.7L HEMI: what octane rating of gas do you use?

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Originally Posted by Jim_in_PA View Post
Summer...20-22 hwy and about 16 in general rural driving. Slightly less in the Winter for both.
I filled up 4 times now and each time I calculated to have 12 miles per gallon. I am not sure if I have to worry about the high gas consumption.
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Old 11-30-2014, 02:31 AM
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Re: For 5.7L HEMI: what octane rating of gas do you use?

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Originally Posted by chrisneu View Post
I filled up 4 times now and each time I calculated to have 12 miles per gallon. I am not sure if I have to worry about the high gas consumption.

Wish I was getting that lol.. Don't want to even say what I get but I fill up only with bp 89... Filled it up once with 87 and 3 times with 93 when I first got the car.. Didn't notice a mileage difference but definitely feels smoother with 89.. Car has 3316 miles summit 2015 5.7 v8 only going to use bp bc its cheaper here and it's a top tier gas...


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  #20  
Old 11-30-2014, 02:38 AM
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Re: For 5.7L HEMI: what octane rating of gas do you use?

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Originally Posted by Kaetone View Post
Wish I was getting that lol.. Don't want to even say what I get but I fill up only with bp 89... Filled it up once with 87 and 3 times with 93 when I first got the car.. Didn't notice a mileage difference but definitely feels smoother with 89.. Car has 3316 miles summit 2015 5.7 v8 only going to use bp bc its cheaper here and it's a top tier gas...
I wonder why there such a big difference in gas consumption. Mine is a 2014 Overland 5.7 with 1200 miles. Just bought it 4 weeks ago. Love it otherwise.
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Old 11-30-2014, 02:52 AM
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For 5.7L HEMI: what octane rating of gas do you use?

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Originally Posted by chrisneu View Post
I wonder why there such a big difference in gas consumption. Mine is a 2014 Overland 5.7 with 1200 miles. Just bought it 4 weeks ago. Love it otherwise.

Well my driving habits suck.. I commute from jersey to New York during rush hour annnd when I come back im stuck in some construction detour on a regular basis... Not to mention I sit and idle just to utilize my wifi.. The math is horrible on my end.. Just drove home today from the gas station off the holland to my house and I got 19 mpg with my acc on between 70 and 60 mph trying to find the sweet spot.. I think it's 62mph but it's hard to tell with all the ups and downs.. No traffic and slowed down to 40 mph for a few ramps...


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  #22  
Old 11-30-2014, 05:02 PM
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Re: For 5.7L HEMI: what octane rating of gas do you use?

For the first time I filled up my tank with 87 yesterday, just to try it out, and after about 30 miles that I drove so far, I got 16 miles per gallon! That's very different from my previous 12 miles per gallon. Will see what mileage I will end up with the next time I get gas.
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  #23  
Old 12-01-2014, 01:01 PM
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Re: For 5.7L HEMI: what octane rating of gas do you use?

I use 93 most of the time and 89 sometimes. It fly's!
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  #24  
Old 12-01-2014, 04:47 PM
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Re: For 5.7L HEMI: what octane rating of gas do you use?

Quote:
Originally Posted by johnnyiowa View Post
I use 91 at Costco since they don't have 89 at the pump.
Fill it with a mix of premium and regular and you have home-brewed midgrade, which is what the OM should indicate since at higher altitude mid-grade is lower pump rating.
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