87 or 91 Gas?
10-24-2011, 09:06 AM
#1
JK Enthusiast
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87 or 91 Gas?
I got a new 2012 with the new engine and the manual says to pump 87 but wouldn't it be better to pump 91 so it burns slower and cleaner.. Planning to keep it forever as make it last
10-24-2011, 09:09 AM
#2
87 would be absolutely fine. If youre worried about burning cleanly you can always run 87 with techron from shell.
For me with my 2010, I only run 91 to get rid of any pinging
For me with my 2010, I only run 91 to get rid of any pinging
10-24-2011, 09:57 AM
#4
JK Super Freak
10-24-2011, 10:12 AM
#5
JK Enthusiast
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I run 87 and have no problems. The only reason I would run 91 is if I started experiencing knocking... Go with what the manual says and then adjust if necessary.
10-24-2011, 11:31 AM
#6
JK Freak
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I run 87 and have absolutely no problems in my 08 JKU. However I run 92 on my Mustang during the summer since I have a worked motor. I run 91 in the spring/fall. Helps prevent pre combustion with higher octane
10-24-2011, 11:36 AM
#7
JK Super Freak
87 burns just as clean as 91 or 93. The higher octane is less prone to detonation(pinging) by burning slower, causing a power loss in an engine designed and tuned to run on 87.
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Cheap gas. Remember when regular was 99 cents a gallon
10-24-2011, 12:12 PM
#10
JK Enthusiast
What he said. Well, mostly. You can run cheap gas just fine as long as you run a tank or two of good stuff through it every few tanks. The off-brand gas stations don't put anywhere near as many detergents and cleaners in, assuming they put any in at all! And if you've been running on cheap gas for a long time, it may take a lot more than just one or two tanks of good gas to clean things up.
But as for the octane you burn, start off with regular. If you hear knocking from your engine, then jump up a grade. I always run regular at home. But when I went to Colorado a few weeks ago, I found myself having to run mid-grade to keep the engine from knocking when at full throttle (which was just about every time I was on a highway going uphill). Granted, regular at home is 87 octane, but in Colorado, regular is only 85. Supposedly the altitude makes engines more resistant to detonation, but apparently it didn't make mine resistant enough to handle 85 octane.
For more info on octane: Wikipedia - Octane Rating: Effects of octane rating
But as for the octane you burn, start off with regular. If you hear knocking from your engine, then jump up a grade. I always run regular at home. But when I went to Colorado a few weeks ago, I found myself having to run mid-grade to keep the engine from knocking when at full throttle (which was just about every time I was on a highway going uphill). Granted, regular at home is 87 octane, but in Colorado, regular is only 85. Supposedly the altitude makes engines more resistant to detonation, but apparently it didn't make mine resistant enough to handle 85 octane.
For more info on octane: Wikipedia - Octane Rating: Effects of octane rating
Last edited by Krynn; 10-24-2011 at 12:14 PM.