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Old 02-07-2011, 01:34 AM   #1
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What 87 gasoline okay

I was reading the in book that the 5.7s are to use 89 octane. What is everyone using?

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Old 02-07-2011, 05:29 AM   #2
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What 87 gasoline okay

89 is recommended... not required. I normally alternate tanks - 87, then 89... repeat as necessary
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Old 02-07-2011, 08:12 AM   #3
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What 87 gasoline okay

Okay. I'm gonna do that.
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Old 02-07-2011, 11:50 AM   #4
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What 87 gasoline okay

I use 93 octane exclusively. It isn't required, but I try to squeeze all the performance I can out of my truck. I'm running the Superchips 91 tune.

With Superchips you can use their 87 octane tune and run 87 octane exclusively. I did that when gas was $4 a gallon.
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Old 02-07-2011, 02:14 PM   #5
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What 87 gasoline okay

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Old 03-20-2011, 09:14 PM   #6
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What 87 gasoline okay

i use superchip n use 91 tunes.. n question ... if u usin 91 tues programmer .. can u still use 87 if ur superchip is 91 tunes?.. let me knw .. i always been usin 91 n it run great

flow
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Old 03-20-2011, 10:23 PM   #7
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What 87 gasoline okay

I wouldn't use 87 octane with the 91 tune. The 91 tune advances the timing and with 87 octane there could be knocking.
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Old 03-20-2011, 11:50 PM   #8
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What 87 gasoline okay

Superchips 87 tune with 89 in the tank.
Used 89 even without the tune.
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Old 03-21-2011, 10:58 AM   #9
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What 87 gasoline okay

I use 91 with a Super Chip tune set on High Performance.
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Old 03-22-2011, 05:03 AM   #10
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What 87 gasoline okay

I have my Superchips programed at the 87 and I mix it up every two to three tanks I run 90 but the rest of the time I use 87. No problems but it is a MOOSE...
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