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  #1  
Old 04-29-2011, 10:15 AM
MWDK MWDK is offline
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Default Does higher octane number give better mpg?

Hi
I just got my first vehicle yesterday (2002 Ford Ranger FX4), and I'm wondering what the differences between the octane numbers at gas stations means for the way my engine runs and the mpg.

Will I get better mileage/a better running engine if I fill her up with 91 instead of 87?
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  #2  
Old 04-29-2011, 10:17 AM
HazardousRanger HazardousRanger is offline
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Default Re: Does higher octane number give better mpg?

Use the search function this question has been answered.

----------

read thru this

Gasoline/Octane Questions
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Old 04-29-2011, 10:32 AM
FireRanger FireRanger is offline
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Default Re: Does higher octane number give better mpg?

Short answer. No. Octane has a specific purpose. The engine is designed to run properly only on 87. Putting in anything else will degrade performance if anything.
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  #4  
Old 04-29-2011, 10:51 AM
08Ranger Sport 4x4 08Ranger Sport 4x4 is offline
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Default Re: Does higher octane number give better mpg?

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Originally Posted by FireRanger View Post
Short answer. No. Octane has a specific purpose the engine is designed to run properly only on 87. Putting in anything else will degrade performance if anything.
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Old 04-29-2011, 11:19 AM
TerrenceStuart TerrenceStuart is offline
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Default Re: Does higher octane number give better mpg?

keep it at 87.
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Old 04-29-2011, 11:29 AM
VegasRanger02 VegasRanger02 is offline
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Default Re: Does higher octane number give better mpg?

65+2-60+80 is the Octane you should use. Dont waste your money
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Old 04-29-2011, 12:12 PM
pooleo pooleo is offline
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Default Re: Does higher octane number give better mpg?

im just going to put my .02 in here and probably start a big ol shit storm. I personally beleive that the 93 octane helps out. I have run real world test on this. A couple years back while working a 100 miles round trip to work and back I tested this exact thing. Filled up with 87 ran until check gauge light came on, 280 or so miles. Fill up with 93, over 300 miles to a tank. One time I ran 87 from the wesco, got 212 miles to the tank. So it does help. You can look at all the stuff online about it, best thing to do is just run it and see what happens. Fill up with 87 and run till the check gauge comes on, the second it lights, get fuel, if you cant right away record how many miles it take to find a fuel station. Then, fill up with 93 and run same test. For me it worked out well because I was driving the exact route everyday. I also run 110 in my harley, that is designed for 87. It runs a shit ton better then when on 87, the pipes are nice and clean also, not all gummed up with black shit.

Just try it, its only going to run you about $4 per tank more to fill up on 93.
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Old 04-29-2011, 12:33 PM
Rango88 Rango88 is offline
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Default Re: Does higher octane number give better mpg?

Quote:
Originally Posted by pooleo View Post
im just going to put my .02 in here and probably start a big ol shit storm. I personally beleive that the 93 octane helps out. I have run real world test on this. A couple years back while working a 100 miles round trip to work and back I tested this exact thing. Filled up with 87 ran until check gauge light came on, 280 or so miles. Fill up with 93, over 300 miles to a tank. One time I ran 87 from the wesco, got 212 miles to the tank. So it does help. You can look at all the stuff online about it, best thing to do is just run it and see what happens. Fill up with 87 and run till the check gauge comes on, the second it lights, get fuel, if you cant right away record how many miles it take to find a fuel station. Then, fill up with 93 and run same test. For me it worked out well because I was driving the exact route everyday. I also run 110 in my harley, that is designed for 87. It runs a shit ton better then when on 87, the pipes are nice and clean also, not all gummed up with black shit.

Just try it, its only going to run you about $4 per tank more to fill up on 93.
not trying to bash what you experienced, just my .02 cents (trying to avoid a storm as well). I just think that its hard to take that difference with the MPG unless its in a controlled environment. Tire pressure could have changed, wind speed, temperature are all things that could have influenced you MPG over the octane level.... Perhaps a controlled test would yield suitable results.
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Old 04-29-2011, 01:14 PM
08Ranger Sport 4x4 08Ranger Sport 4x4 is offline
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Default Re: Does higher octane number give better mpg?

Look at Andy being a scientist over here... lol.
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  #10  
Old 04-29-2011, 01:17 PM
Rango88 Rango88 is offline
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Default Re: Does higher octane number give better mpg?

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Originally Posted by 08Ranger Sport 4x4 View Post
Look at Andy being a scientist over here... lol.
lol and I prob failed miserably, its prob all that cod4 that fried my brain .
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Old 04-29-2011, 01:31 PM
pooleo pooleo is offline
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Default Re: Does higher octane number give better mpg?

Quote:
Originally Posted by Crowd88 View Post
not trying to bash what you experienced, just my .02 cents (trying to avoid a storm as well). I just think that its hard to take that difference with the MPG unless its in a controlled environment. Tire pressure could have changed, wind speed, temperature are all things that could have influenced you MPG over the octane level.... Perhaps a controlled test would yield suitable results.

agreed. This is why I did it during that time of work. Thats about the most consitant I could get!
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  #12  
Old 04-29-2011, 01:34 PM
Rango88 Rango88 is offline
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Default Re: Does higher octane number give better mpg?

Quote:
Originally Posted by pooleo View Post
agreed. This is why I did it during that time of work. Thats about the most consitant I could get!
still pretty good though
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  #13  
Old 04-29-2011, 01:34 PM
prestidigitizer prestidigitizer is offline
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Default Re: Does higher octane number give better mpg?

See this comment by rwenzing, esp. the last 2 paragraphs:

Gasoline/Octane Questions
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Last edited by prestidigitizer; 04-29-2011 at 01:37 PM.
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Old 04-29-2011, 01:45 PM
knightmare1015 knightmare1015 is offline
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Default Re: Does higher octane number give better mpg?

From what I gather the only time octane numbers should be considered is if you rebuilt your engine with a different Compression ratio (CR). The stock CR on a V6 Ranger is 9.8:2, but don't hold me to that now I may be off a bit. It's the same reason as why 100% pure gasoline runs better in my truck than the 10% based ethanol gasoline. It still runs good on the ethanol based crap but I lose a bit in terms of mpg's.
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Old 04-29-2011, 03:25 PM
Botta Ranger Botta Ranger is offline
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Default Re: Does higher octane number give better mpg?

Quote:
Originally Posted by knightmare1015 View Post
From what I gather the only time octane numbers should be considered is if you rebuilt your engine with a different Compression ratio (CR). The stock CR on a V6 Ranger is 9.8:2, but don't hold me to that now I may be off a bit. It's the same reason as why 100% pure gasoline runs better in my truck than the 10% based ethanol gasoline. It still runs good on the ethanol based crap but I lose a bit in terms of mpg's.
Agree on the need to increase CR to take advantage of antiknock property of higher octane fuel. Ethanol simply contains less chemical energy to convert to thermal energy.
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