87 vs 89 octane?

[flyers21fan]

I know dodge recommends 89 octane in my 5.7 hemi but says 87 is ok too. Just curious if anyone can tell if there is a significant difference?

 

[jei3us]

I ran a full tank of 91 a few weeks ago with the low gas prices I figured wth. What I noticed was better performance more responsive acceleration but the hemi burned that gas super quick faster than 87. My truck is a daily so I wouldn't do it again it was more of an experiment for me.

 

[flyers21fan]

same here i have been putting 89 in over the last two fill ups, I figure why not its only 2.00/gallon and i dont know if its just in my head but truck seems to idle smoother and exhaust sounds louder with better pick up when i hit the gas

 

[justin13703]

I ran 87 in mine for a while until I saw the manual recommends 89. Now I use 89 just because the manual said it recommends it so that's what I use. I felt absolutely no difference going from 87 to 89. You will likely feel no difference going to a higher octane unless you have a tune for it.

 

[blackbeautyhemi]

I run top grade in mine and it does seem to just run smoother all around.. I have my tuner on the top setting so it's suppose to be ran with top grade and I have a power and mileage gain

 

[HemiLonestar]

87 tends to be ****tier gas all around. There have been grenaded 5.7's that were attributed to running regular gas. Funny thing is, the new 6.4's in the HD's have 87 recommended.

 

[ST-8]

Nobody ever wants to put the recommended fuel in these things.

 

[vichris]

Personally with gas running around $1.65 here its only a couple bucks per tank to use the 89 in my Ram truck. I ran either 89 or 91 in my RT 5.7L Challenger. Traded it off a couple of years ago and have the 6.4L SRT8 now. I ran 89 in it once and noticed a significant loss in performance. I run 91 octane exclusively in my SRT8 Challenger.

 

[Sportznut]

Does running 87 impact warranty, reduce life or damage anything? Or is it just a performance issue?

 

[xb1230]

Octane is basically a agent that prevents pre-ignition when changing the timing on the spark ignition. Changing the timing helps with getting the best performance/gas mileage for the fuel you are using.

If your vehicle is tuned to use 89, you may not get the most out of your performance. Unless the dealer can prove that not using the proper grade of fuel caused the failure(which I have rarely seen), you should not have any issues with using a different fuel grade.

 

[KarL45]

87/89 octain fuels

If the manufacturer says to use a minimum octane rating, that is what should be used. That said, for going higher, there generally should be no noticeable difference, BUT, driving style, work demands, and also carbon deposits (doubt any of us have that problem, lol ) can play a part in that. The newer engines have a knock sensor that should retard the timing if pre ignition occurs. Those in the lower elevations are more prone to pre ignition than those of us in higher elevations.As for warranty issues, if damage were done to an engine from running too low of octane rating, it would be easily noticed by the dealership and no doubt would void the warranty. Also, I have seen and heard of knock problems with the Dodge engines in the 2000 year ranges. Think , as haven't heard much of late, that they have that problem corrected.

 

[smiley]

I prefer 89 and if no ethanol is available that is best.

 

[HemiLonestar]

Personally with gas running around $1.65 here its only a couple bucks per tank to use the 89 in my Ram truck. I ran either 89 or 91 in my RT 5.7L Challenger. Traded it off a couple of years ago and have the 6.4L SRT8 now. I ran 89 in it once and noticed a significant loss in performance. I run 91 octane exclusively in my SRT8 Challenger.

SRT vehicles require premium. Why'd you even try lol?

 

[xb1230]

gas prices around here are still wayyyyy higher than you guys... We currently pay around 3,50$ to 3,75$ per gallon... and premium is a 50¢/gallon premium. So for me it is 10$/ full tank between using regular and premium...

Just saying...

 

[WalterG]

I can't get 89 here, we only have 85, 87 and 91 in this neck of the woods. That said, I have only run 91 in mine so far since I fuel at Sam's Club and they only have 85 and 91.

Last I fueled my Charger 91 was 2.009 / gallon, and I think the last I fueled the truck it was 2.119, but that was two weeks ago.

 

[hemihustlin]

Does running 87 impact warranty, reduce life or damage anything? Or is it just a performance issue?

Engine Knock Explained

gas prices around here are still wayyyyy higher than you guys... We currently pay around 3,50$ to 3,75$ per gallon... and premium is a 50¢/gallon premium. So for me it is 10$/ full tank between using regular and premium...

Just saying...

10 bucks hardly even buys lunch these days, when you are buying 100 litres of fuel 10 more or 10 less not much of a difference i think.
Obviously when gas was 1.50$/litre its painfull but like they say, with great power comes great responsibility and high fuel consumption.

 

[vichris]

SRT vehicles require premium. Why'd you even try lol?

Ran low on gas on the interstate and the only gas station for miles didn't have premium..............


.

 

[ST-8]

Premium being 50 cents more than 87 has been the norm in my neck of the woods. I used to run 89 a lot til I upgraded the cam in my truck a couple yrs ago an it's been 93 ever since. $4.50 + a gallon an all lol

 

[justin13703]

You won't have warranty issues using 87 vs 89. It says right in the manual that 87 is acceptable but 89 is recommended. I can't see how using 87 instead of 89 is going to grenade a motor unless it's highly modified, in that case you should probably be using 93 anyway.

There was a guy on the last forum I was on with my last vehicle that developed supercharger systems and had everything you could imagine for testing/diagnosing/monitoring a vehicle, and dynos. Underdog Racing Development is the name of his company. He did a few extensive tests on the fuel octane topic, and determined that, on a STOCK vehicle, using higher than the recommended fuel octane actually got you a little less power and mileage. Now if you're not stock, and you're modified or tuned, you want to use a higher octane to safely make the extra power.

So in short, on a stock, well maintained truck, use 87 or 89. Whatever floats your boat lol. If you can get 89, just use it. If you put 87 in, there's no need to think your engine is going to explode because of it. On a engine in good running condition, 87 should not be causing knock, unless you got junk gas and it's actually not 87.

 

[Sportznut]

What would be the impact if I used 92 Octane "Clear"?