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Old 08-28-2014, 12:11 AM
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What's your opinion on fuel?

Hey guys, random question...
What is everyone's opinion on the type of fuel you use (ie: E85/87/93) in your V6 non-diesel WK2? I know most people use your basic unleaded, but I've heard others swear by premium fuel even when their cars dont necessarily require it? Does higher octane fuel burn slower and thus provide more MPG? Any benefit at all to using a higher octane?

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Old 08-28-2014, 07:34 AM
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Re: What's your opinion on fuel?

Octane is for reducing "knock" in your engine, that's it...no BTU increase whatsoever, but higher octane level in your fuel does allow you to bump up the the engines timing for increased power. Higher octane fuel also helps protect against knock when at higher altitude, and when towing heavy loads.

So in other words, if your engine is designed to run on 87 octane fuel, and you haven't remapped the ECU, you're close to sea level, and you're not towing a heavy load, running higher octane fuel is just a waste of money. A greater concern you should have is insuring you are buying fresh gas (no water) from a high volume gas station.
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Old 08-28-2014, 07:47 AM
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Re: What's your opinion on fuel?

Years back, the gas companies spent millions of dollars (when millions was a lot of money) advertising all the advantages of using premium fuel. Mostly they proclaimed more power and better mileage. The government made them pull the ads, rightfully accusing them of false advertising. It takes generations to filter these falsehoods out of a population's memory. Everybody has a grandpa who still believes in what Madison Avenue put on the screen.

I know if I ever get a Tesla I'll be looking for premium electricity to keep the batteries charged longer. It might even increase acceleration.


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Old 08-28-2014, 10:19 AM
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Re: What's your opinion on fuel?

I found a station near me has E85 for $2.19 a gallon - compared to $2.69 .. I tried a tank and noticed ZERO difference. 50 cents/gallon is a big savings.

and its only a lease, and I hate it.. so I dont care what I put in lol - cheaper the better
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Old 08-28-2014, 10:29 AM
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Re: What's your opinion on fuel?

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Originally Posted by StaticFX View Post
I found a station near me has E85 for $2.19 a gallon - compared to $2.69 .. I tried a tank and noticed ZERO difference. 50 cents/gallon is a big savings.

and its only a lease, and I hate it.. so I dont care what I put in lol - cheaper the better
How's your MPG been using the E85?
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Old 08-28-2014, 11:40 AM
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Re: What's your opinion on fuel?

Quote:
Originally Posted by StaticFX View Post
I found a station near me has E85 for $2.19 a gallon - compared to $2.69 .. I tried a tank and noticed ZERO difference. 50 cents/gallon is a big savings.

and its only a lease, and I hate it.. so I dont care what I put in lol - cheaper the better
Whoa! Why the hatred? Do you notice the E85 giving you less gas mileage?
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Old 08-28-2014, 11:59 AM
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Re: What's your opinion on fuel?

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Originally Posted by StaticFX View Post
I found a station near me has E85 for $2.19 a gallon - compared to $2.69 .. I tried a tank and noticed ZERO difference. 50 cents/gallon is a big savings.

and its only a lease, and I hate it.. so I dont care what I put in lol - cheaper the better
Wow! 2.69 E87???? Where did you located??
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Old 08-28-2014, 12:11 PM
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Re: What's your opinion on fuel?

Quote:
Originally Posted by lovemesomejeep View Post
Hey guys, random question...
What is everyone's opinion on the type of fuel you use (ie: E85/87/93) in your V6 non-diesel WK2? I know most people use your basic unleaded, but I've heard others swear by premium fuel even when their cars dont necessarily require it? Does higher octane fuel burn slower and thus provide more MPG? Any benefit at all to using a higher octane?
My opinion is that gasoline fueled engines work best if you put fuel in the tank.

Beyond that, this looks like just another thread where more superstition, anecdotal reports, mis-information, etc. than fact will result.

The engineers who designed the engine and spec'd the fuel must all be a total bunch of incompetent idiots judging from the repeated resurrection of these topics.

Oh, don't buy gas at a station where the pump bottoms are covered by more than a foot of water due to flash flooding is probably a good idea.

Other than that, how about them Mets?
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Old 08-28-2014, 12:39 PM
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Re: What's your opinion on fuel?

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Originally Posted by lstowell View Post
My opinion is that gasoline fueled engines work best if you put fuel in the tank.

Beyond that, this looks like just another thread where more superstition, anecdotal reports, mis-information, etc. than fact will result.

The engineers who designed the engine and spec'd the fuel must all be a total bunch of incompetent idiots judging from the repeated resurrection of these topics.

Oh, don't buy gas at a station where the pump bottoms are covered by more than a foot of water due to flash flooding is probably a good idea.

Other than that, how about them Mets?
Yea I figured this would be one of those annoying questions that gets asked often. i currenty drive a V6 Altima that "recommends" premium fuel and I'll be picking up my '15 GC Limited on Tuesday. Im just so used to using premium that Im looking forward to the savings of using regular. I just wanted to make sure there wasnt some benefit to engine life, fuel economy, etc etc to the premium fuel. I think you answered my question
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Old 08-28-2014, 01:05 PM
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Re: What's your opinion on fuel?

Quote:
Originally Posted by lovemesomejeep View Post
Yea I figured this would be one of those annoying questions that gets asked often. i currenty drive a V6 Altima that "recommends" premium fuel and I'll be picking up my '15 GC Limited on Tuesday. Im just so used to using premium that Im looking forward to the savings of using regular. I just wanted to make sure there wasnt some benefit to engine life, fuel economy, etc etc to the premium fuel. I think you answered my question
OK, I tend to use midgrade myself, in the V8. If an engine has multiple recommends, such as the V8 which has both 87 and 89, I pretty much always use the higher end of that range. I would not bet a dime I could actually tell the difference between regular and midgrade even in the hemi for normal driving.

Modern engines can take a wider variety of fuel than most OMs indicate, they just alter the engine controls a bit to avoid knock and keep emissions in check.

Beyond that, you get into mythology, where the best answer is to Read The Fine Manual... Your Nissan engine is a different design, so it would be irrelevant for the Jeep.

If you start modding the engine, then you might need to consider different fuel. Unfortunately you can't tune them by listening for the very very brief tick tick tick under full throttle any more--modern controls are just too fast.
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Old 08-28-2014, 10:34 PM
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Re: What's your opinion on fuel?

As mentioned gas is gas, same amount of "power" in a gallon 87 or 93 PON. What higher octane does is burn slower (so needs more advance) and autoignites (detonates) at a higher pressure (to avoid detonation/knock with high compression).

Back in the day if you ran 22c/gal premium instead of 18c/gal regular you bumped the timing a few degrees to compensate. Takes a computer to change the advance these daze.

So octane required is a function of maximum cylinder pressure (cylinder diameter x barometric air pressure x compression ratio x efficiency to simplify A Lot.) Toss in boost or direct injection and the calculations change dramatically (lower compression/larger chamber and lotsa boost = More Power).

Bottom line, without addtional advance 93 in an engine designed/mapped for 87 = less power/less mpg/more heat.

Now to run E85 properly requires more advance than 87 so maybe the Pentastar maps can handle high test. I have not a clue, too many variables. I just run 87 PON from Sam's or Hess

More than you wanted to know ?
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Old 08-30-2014, 12:08 AM
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Re: What's your opinion on fuel?

Quote:
Originally Posted by hiend View Post
Wow! 2.69 E87???? Where did you located??
lol western NY... on the way to NC i saw one place in VA? that had gas 87 for 3.19

I notice zero difference with performance or mileage.
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