what octane do you use? - Page 2 - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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  #26  
Old 02-20-2008
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Originally Posted by FireRanger View Post
Thats what I've been saying all along.

LOL..
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  #27  
Old 02-20-2008
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87....but i got a question, if i run the demon ingtion module that will let me run a wider plug gap will i need a higher octane fuel or will 87 be fine
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  #28  
Old 02-20-2008
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I run 87 and use either Amoco or Marathon fuel, mileage seems a little better with the Marathon. I also run a bottle of Red Line SI-1 every OCI (5000 miles), so I'm not too worried about missing out on the added cleaners.
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  #29  
Old 02-20-2008
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Originally Posted by Roach2004 View Post
You mean every gas station in Houston?
ha yea pretty much, but im talking bout those FINA stations n **** ha. or those ghetto ones out in acres homes area
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  #30  
Old 02-20-2008
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87. I can't afford anything else, heck I can barely afford that.
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  #31  
Old 02-20-2008
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Originally Posted by budwish View Post
87....but i got a question, if i run the demon ingtion module that will let me run a wider plug gap will i need a higher octane fuel or will 87 be fine
87 will be fine. A hotter spark with a wider plug gap helps to insure all the fuel ignites in the conbustion chamber at the right time .
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  #32  
Old 02-20-2008
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the gas station thats closet to where im at
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  #33  
Old 02-20-2008
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So far, I've been running 87 because it doesn't have ethanol (or as much anyway) as the higher octane we get here in the Cornbelt. I may try the ethanol blend, but in my other vehicles it has resulted in poorer mileage.

The first two fills have been from Walmart (Murphy Oil Co.). I got 17.3 and 17.4 mpg, which seems to be pretty good for winter blend from what I have read hear and on other forums. In the past, I have gotten better results with Casey's, so I'll try that in the near future.

I'll probably run some Seafoam through my truck too. It has 24k miles, so that might not hurt anything. My truck is stock, so I haven't had any issues with the 87 octane.
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  #34  
Old 02-21-2008
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just did 6 tank fulls of 92 on my 92 tune, cant tell much of a difference than 87, so i'll stick with 87. the 87 performance tune seems to be far mor fuel efficient than the 87mpg tune, weird, and the 87mpg seems to have more power. meh, safeway fuel seems to get me the best fuel economy, shell works well too. i'm trying to avoid anywhere that has the ethanol sticker haha.
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  #35  
Old 02-21-2008
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- 87 in my Ranger and Taurus GL. No need to spend any more coin then I have to.

- 93 in my SHO, which calls for premium from the factory.

FWIW, I believe the 4.0L SOHC uses a knock sensor which means that the PCM has the capability of retarding the timing if/when detonation is detected. So therefore it is possible that using a higher octane fuel in a SOHC can actually "improve" overall performance, at least in cases where the engine is prone to pinging with lower octane fuel.
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