87 vs 89/91 vs 93 - Jeep Wrangler Forum

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Old 03-21-2013, 11:01 AM   #1
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87 vs 89/91 vs 93

Any one done any testing to see what kind of mpg they are getting with the different octanes?

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Old 03-21-2013, 11:04 AM   #2
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higher octane has less energy. The only reason to run higher octane in a stock jeep is if you use a programmer to advance the timing. Other then that you will get more out of the lower octane gas.

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Old 03-21-2013, 11:08 AM   #3
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Quote:
Originally Posted by Cold View Post
higher octane has less energy. The only reason to run higher octane in a stock jeep is if you use a programmer to advance the timing. Other then that you will get more out of the lower octane gas.
With a programmer and 93 octane would it give better mpg than stock 87 octane?
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Old 03-21-2013, 11:53 AM   #4
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The only use I found in 89 over 87 at least in my area is the winter bend. Seems my Jeep runs better and gets a little better fuel mileage during the winter months with 89 and go back to 87 in the Spring.
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Old 03-21-2013, 12:36 PM   #5
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The programmer made me use more gas in the performance mode but it had more power. (Pay to Play)

I find myself running 89 a lot of the time because I hear pinging when I climb hills on the freeway in the winter.
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