Which Gas should i use - Ford Mustang Forum
 
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post #1 of 6 (permalink) Old 02-09-2011 Thread Starter
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Post Which Gas should i use

I have a stock 2002 V6 msutang that i am just curious which gas would be better to run 87 unleaded octane or 91 premium octane?

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post #2 of 6 (permalink) Old 02-09-2011
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87 other than that your wasteing money

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post #3 of 6 (permalink) Old 02-09-2011
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Either is good but i'd only run higher octane if the cheap stuff makes your motor ping. Maybe a tank full of premium or a can of injector cleaner when you change the oil would be a good idea too. I only run premium in my 5.0 and in 13 years ive never had any fuel system problems at all so maybe its the fuel or maybe ive just been lucky

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post #4 of 6 (permalink) Old 02-09-2011
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I was running higher octane fuel in my 2006 v6 and over time it caused it to hesitate at stop lights when trying to accelerate. I switched to 87 and my problem was solved. and besides, its cheaper :P

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post #5 of 6 (permalink) Old 02-09-2011
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If it's not tuned for it or says to use premium, use 87. Like 05horse said, your wasting your money. Also 91 is harder to ignite than 87, most believe it's the other way around but its not. That's why people with alot higher compression or higher timing uses 91 or 93, to prevent detonation, slow burn rate. Alot of cars that should use 87 but put 91 or 93 in can have driveablitly issues due to it. Alot of time it can't combust all of the gas in the cylinder and it gets pushed out of the exhaust. This can actually harm your catalytic converts if you have them. With todays gas prices, if you can use 87, use it. I have to use 93 in my L and Cobra, the Expedition has a 91 tune but I think i'm going to get a 87 tune for it.

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post #6 of 6 (permalink) Old 02-10-2011
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Originally Posted by 2oo5GT View Post
If it's not tuned for it or says to use premium, use 87. Like 05horse said, your wasting your money. Also 91 is harder to ignite than 87, most believe it's the other way around but its not. That's why people with alot higher compression or higher timing uses 91 or 93, to prevent detonation, slow burn rate. Alot of cars that should use 87 but put 91 or 93 in can have driveablitly issues due to it. Alot of time it can't combust all of the gas in the cylinder and it gets pushed out of the exhaust. This can actually harm your catalytic converts if you have them. With todays gas prices, if you can use 87, use it. I have to use 93 in my L and Cobra, the Expedition has a 91 tune but I think i'm going to get a 87 tune for it.
+1
Use what your car is tune for. Stock that is 87 octane.
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