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Old 04-17-2014, 10:36 AM
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Using 89 Octane

My Trailhawk has the 3.2L V6. The printed user guide says to use 87 octane. The CD v2 that came with the vehicle says to use 89 octane. Has anyone seen any significant difference when using 89 octane fuel?

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Old 04-17-2014, 07:29 PM
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Re: Using 89 Octane

I have been using 89 and plan to back down to 87after 1000 miles.
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Old 04-18-2014, 12:11 PM
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Re: Using 89 Octane

I started out with 89 to get a baseline then have been running 87 recently to see if I see a difference. I think there is a slight drop in MPG with the 87 but nothing big( maybe .5-1 MPG max ). Performance feels the same but I drive very conservative anyway. I think when I am towing my boat I will run the 89 just to be safe.
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Old 04-18-2014, 12:25 PM
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Re: Using 89 Octane

There should be very minimal difference between 87/89 as the engine ECM will quickly adjust timing etc so all runs fine. The only time you may want to run 89 is if you are working the engine out (mountains, towing?, drag racing , etc...) as the slight extra energy of 89 over 87 is of some albeit small benefit.
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Old 04-18-2014, 12:44 PM
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Re: Using 89 Octane

I have been running 89 in my TH 3.2 since new, I can not say why I chose to do that but like other posters I though that for the first 1000 miles it might be worthwhile. I have approx. 1200 miles on the vehicle now and have been alternating some 87 in and ironically I see higher MPG average (1.2 gals. more) when burning the 87 vs the 89, go figure! In around town running around i have been averaging 19.2 on 89, the last tank of 87 i got 20.7. i am done with the 89 at this point. Zero issues other than a weird little rattle in the dash that comes and goes, great vehicle that is fun to drive.
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Old 04-18-2014, 02:54 PM
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Re: Using 89 Octane

I am using 87 non ethanol. The only time I will use 89 or a mix of 87/89 is when I tow.
Other than that the only benefit is to the oil companies/dealers.
So unless you have some heavy duty loads 87 will be fine.
I get more benefit from the +.12 per gallon on non ethanol 87 in extra MPG I achieve. The ROI is a big positive.
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Old 04-19-2014, 06:42 AM
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Re: Using 89 Octane

I have used 87 octane since day one and have never even thought of using 89 octane. Last highway trip on my V6 Limited, I averaged 31.6 MPG. Why spend the extra money? Besides I have to use 93 octane on my Porsche Spyder. That's painfully enough at the pump.
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Old 04-20-2014, 09:05 PM
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Re: Using 89 Octane

89 is recommended, although 87 is allowed. I personally would rather pay the extra ten cents per gallon for better performance, and take better care of the investment in the vehicle. I kept my previous two Jeeps for seventeen years each before buying new Jeeps.
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Old 04-22-2014, 02:35 AM
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Re: Using 89 Octane

Black Rover AVERAGED 31.6 mpg in V6?! That is incredible.


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