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  #1  
Old 10-28-2013, 06:02 PM
fishing_5 fishing_5 is offline
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Default Gas Octane Rating questions?

So I have a 2003 Ranger XLT with a 4.0L engine. 112K Miles. I've been recently having bad fuel mileage. Perhaps I was going against the wind, but just haven't noticed the bad mileage until now. I was at my local NAPA and I know the guy that works there. He told me I should be using the 87 octane or better. That should increase it or help it a little. I was using 85 octance, which I told him I was using the 85 the lowest in my area, cus I'm cheap lol.
So in your opion whats the best octance rating fuel type to use in my 4.0L ranger? What do you use?
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Old 10-28-2013, 06:03 PM
djfllmn djfllmn is offline
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Default Re: Gas Octane Rating questions?

87 no more no less
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  #3  
Old 10-28-2013, 06:03 PM
bigfisher bigfisher is offline
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I run 87

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Old 10-28-2013, 06:09 PM
fishing_5 fishing_5 is offline
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Default Re: Gas Octane Rating questions?

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Originally Posted by djfllmn View Post
87 no more no less
So is it possible to harm the engine if you use 85 or even the 91 octane? If so what would be the symptoms?
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  #5  
Old 10-28-2013, 06:11 PM
JerZDevil81 JerZDevil81 is offline
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Default Re: Gas Octane Rating questions?

87 and Seafoam it.

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To high of an octane could create a ping from pre-detonation. Too low of an octane will cause ignition issues and will probably cause exactly what youre having a problem with, bad gas mileage.
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Old 10-28-2013, 06:13 PM
fishing_5 fishing_5 is offline
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Default Re: Gas Octane Rating questions?

Quote:
Originally Posted by JerZDevil81 View Post
87 and Seafoam it.

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To high of an octane could create a ping from pre-detonation. Too low of an octane will cause ignition issues and will probably cause exactly what youre having a problem with, bad gas mileage.

So I will start using 87 octane, but why seafoam?
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Old 10-28-2013, 06:15 PM
JerZDevil81 JerZDevil81 is offline
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Default Re: Gas Octane Rating questions?

Clean out the injectors as well as any crud you got in the tank by using a low octane, cheaper gas.
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Old 10-28-2013, 06:19 PM
fishing_5 fishing_5 is offline
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Default Re: Gas Octane Rating questions?

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Originally Posted by JerZDevil81 View Post
Clean out the injectors as well as any crud you got in the tank by using a low octane, cheaper gas.
use a whole bottle or just some or what?
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Old 10-28-2013, 06:20 PM
JerZDevil81 JerZDevil81 is offline
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Default Re: Gas Octane Rating questions?

If you dont want to go through Seafoaming it, I would at least get a bottle of Techron to throw in your next tank.

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If you seafoam, 1/3 goes into Brake Booster vacuum line, 1/3 in gas tank, and 1/3 in engine oil. Change oil after 200-300 miles if you put it in crankcase.
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Old 10-28-2013, 06:20 PM
Jaws Ranger Jaws Ranger is offline
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I got some 91 today I get it every now and then ford4thot is my bf
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Old 10-28-2013, 06:23 PM
JerZDevil81 JerZDevil81 is offline
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Default Re: Gas Octane Rating questions?

Yea instead of throwing 91 in there I put in a bottle of Techron every oil change. I dont seem to have any MPG issues.
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Old 10-28-2013, 06:24 PM
fishing_5 fishing_5 is offline
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Default Re: Gas Octane Rating questions?

Quote:
Originally Posted by JerZDevil81 View Post
If you dont want to go through Seafoaming it, I would at least get a bottle of Techron to throw in your next tank.

----------

If you seafoam, 1/3 goes into Brake Booster vacuum line, 1/3 in gas tank, and 1/3 in engine oil. Change oil after 200-300 miles if you put it in crankcase.
never heard of putting seafoam in the oil, or in the brake booster.
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Old 10-28-2013, 06:34 PM
copenranger copenranger is offline
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Quote:
Originally Posted by fishing_5 View Post
never heard of putting seafoam in the oil, or in the brake booster.
Your not putting it in the brake booster, its the vacuum line that goes to the brake booster.
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Old 10-28-2013, 06:36 PM
Jaws Ranger Jaws Ranger is offline
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I did that awhile ago... No white smoke

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  #15  
Old 10-28-2013, 06:38 PM
fishing_5 fishing_5 is offline
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Default Re: Gas Octane Rating questions?

well what the whole part about seafoam in the oil? Never heard of it.
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