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Old 04-24-2013, 11:15 AM
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What fuel for 14 5.7

hey guys what fuel are you all using for 2014 5.7?

As I posted in another thread..I just got my 5.7 limited first tank was super...but now im curious what others are using...ty
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Old 04-24-2013, 11:17 AM
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Re: What fuel for 14 5.7

89 is what is recommended for the HEMI. Can accept 87 but 89 is recommended and 93 is a waste.
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Old 04-24-2013, 11:19 AM
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^^^^ I would have to agree here.
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Old 04-24-2013, 11:20 AM
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Re: What fuel for 14 5.7

Quote:
Originally Posted by Keirik View Post
89 is what is recommended for the HEMI. Can accept 87 but 89 is recommended and 93 is a waste.

Really? ok ty for your reply

I know in 2012 srt8 was premium for sure in that 6.4 hemi
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Old 04-24-2013, 11:25 AM
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Quote:
Originally Posted by RECDOG View Post

Really? ok ty for your reply

I know in 2012 srt8 was premium for sure in that 6.4 hemi
SRT is a different animal. The Hemi and V6 aren't going to gain anything with the premium gas. Stick with what works for you and the engine will be fine.
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Old 04-24-2013, 11:38 AM
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Re: What fuel for 14 5.7

sounds good less $$$ lol
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Old 04-24-2013, 01:45 PM
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Re: What fuel for 14 5.7

I only run 87 in my MY12 hemi with great results...including good fuel economy. It's the same engine in the MY14. I haven't tried 89...Costco doesn't sell it.
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Old 04-24-2013, 02:31 PM
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Re: What fuel for 14 5.7

I always put 89 in mine (91 when at Costco) and my wife has put 87 in the first couple times. I don't feel a difference in performance, but for peace of mind, I just put what the manufacture recommends. They build the engine, so they know best right? It's only a couple more bucks and keeps me from going in and buying junk food to make me fatter.
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Old 04-24-2013, 02:33 PM
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Re: What fuel for 14 5.7

89 ... I read the owners manual and decided I'd splurge since I'm coming off 2 1/2 years of 93.

89 is cheap by comparison.
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Old 04-25-2013, 08:38 PM
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Re: What fuel for 14 5.7

Wish they sold 89 in Colorado. Mid-grade here is only 87--since lower pressure at altitude.
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Old 04-25-2013, 08:43 PM
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Re: What fuel for 14 5.7

Maybe 87 is all you need way up in the air like that.


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Old 04-25-2013, 08:52 PM
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Re: What fuel for 14 5.7

Since I live at 8500FT elevation, there is certainly less pressure and thus slower burning fuel mixture. My concern is that modern vehicles already adjust their timing (and fuel amounts) for the higher altitude. So the engine management system is still looking for 89 octane. I know it will "back-off" timing if it detects pre-ignition, but I would rather just feed it the 89 it expects. (Years ago vehicle manufactures sold cars with milled "Denver Heads" to increase internal pressures. Also the carbs came with leaner "Denver Jets." That would not work today because we all drive back down to sea level, and the EPA would not allow those mods.)

Also, several previous vehicles owned were turbo charged. So the altitude excuse to sell lower octane fuel really did not apply for turbo/supercharged engines. For those engines, 93 octane would be nice "up here," but they only sell 91.
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