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  #1  
Old 05-13-2010, 09:40 PM
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New Hemi owner

Just picked up my '05 5.7L WK w/55K miles this evening, also have an 02 4.7L WJ with some tranny issues.

The 'book' recommends 89 octane fuel, but, the previous owner said he used 87 w/o any problems. Has anyone noticed a difference between using these to fuel grades? Does it improve fuel economy on the highway? I'm thinking to just use the 89 for the minimal (~3%) difference in cost?

ThankX,
Ron
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Old 05-13-2010, 09:50 PM
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Re: New Hemi owner

You'll get a number of different recommendations on this question.

My $ .02 - have used 87 for approx. 95% of the 65,000 miles on my 05 Limited 5.7

Haven't had any operating issues. Personally changed the plugs 2 times, no noticeable plug wear problems. Probably saved about $450 or so over the years.
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Old 05-13-2010, 11:21 PM
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Re: New Hemi owner

congrats and welcome! You'll be modding soon and using 93 octane.....so I would use what it calls for in the manual
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Old 05-14-2010, 05:36 PM
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Re: New Hemi owner

I use only 89 in mine as that's what Jeep states in the manual for "optimum performance." Congrats and welcome!!!!!
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Old 05-14-2010, 05:42 PM
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Re: New Hemi owner

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Old 05-14-2010, 06:03 PM
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Re: New Hemi owner

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Old 05-15-2010, 07:45 AM
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Re: New Hemi owner

when i picked up my jeep the dealer said use of 89 will give better performance and fuel economy, using 87 will kick back the timing a little but can be used. I use 89.
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Old 05-15-2010, 10:12 AM
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Re: New Hemi owner

Took a 350 mile road trip in it Friday to pick up my daughter from school.
Filled up w/89 for the way home and averaged almost 18mpg along the hilly west half of the PA turnpike on the return trip. That works for me.

ThankX all,
Ron
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Old 05-18-2010, 01:23 PM
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Re: New Hemi owner

use only 89 and only buy gas from a TOP TIER station, not discount gas; 87 will work in a pinch, but the ignition timing is retarded to prevent knock under load, power output is reduced, and mpg is worse than 89, plus 87 does not contain the same additives that keep from forming carbon deposits in the engine.
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