A lot of debate going on about fuel options going on, so this is to get an idea of what kind of gas we use.

Me, I'm using the 3.5L that burns nothing but the best 91+.

As said in the other post. I plan to use the standard 87 with my 2.4l!

As said in the other post. I plan to use the standard 87 with my 2.4l!

So how'd you answer the poll? :)
I just voted for 87 in the 2.4L and it shows 1 vote for that.

I use 87 Octane in my 2.7L and it runs just fine.

87 in my 3.5 and it runs great!

The pole wasn't ups when I first posted.

Everyone posts "I use 87 and it runs great". Does this mean you've tried 91?

I don't even plan on trying 91. I also heard that switching between 87 and 91 is not good for your motor. Someone correct me if I am wrong. I think it has to do with your computer and the way the gas burns... not too sure, but I am sure someone has the answer...

I don't even plan on trying 91. I also heard that switching between 87 and 91 is not good for your motor. Someone correct me if I am wrong. I think it has to do with your computer and the way the gas burns... not too sure, but I am sure someone has the answer...

Look at this way. The engineers that design the engine did it to use 87 octane fuel. There is no advantages of using a higher octane fuel that will burn slower. Use gasoline from a company that blends their gasoline with additives in both grades.

I don't even plan on trying 91. I also heard that switching between 87 and 91 is not good for your motor. Someone correct me if I am wrong. I think it has to do with your computer and the way the gas burns... not too sure, but I am sure someone has the answer...

Switching between 87 and 91 may not actually do harm, but as Zonestar said, there is no advantage to using a higher octane (slower burning) gas in a car that was designed to use 87.

Disclaimer to keep Avenged happy :gr_grin:
There doesn't appear to be conclusive evidence that there is no advantage to using higher octane. At least none that we have found yet.

Switching between 87 and 91 may not actually do harm, but as Zonestar said, there is no advantage to using a higher octane (slower burning) gas in a car that was designed to use 87.

Disclaimer to keep Avenged happy :gr_grin:
There doesn't appear to be conclusive evidence that there is no advantage to using higher octane. At least none that we have found yet.

So am I wasting money putting in 89...It seems to burn the same, I don't feel any difference in performance...so yeah... :P

Everyone posts "I use 87 and it runs great". Does this mean you've tried 91?


I can't honestly say I have. And I'm too lazy right now to read through my posts in the "other" gas mileage thread where I outlined things I tryed and what work and what didn't.

I know for a fact I tryed 89. I believe I even went 2 maybe 3 (again I don't recall) tanks in a row, and confirmed that it was either worse or that there was a minimal increase at best. And we are talking .5 mpg or less.

And no I don't use the evic to calculate it, I do it with good old fashioned math.

I run 87. I get absolutely zero pinging or knocking. My gas mileage is consistantly better than with 89 octane. I commute 35 miles one way, mixed city/highway, mixed stop and go. I rarely use the auto stick, and I rarely mash the peddle to the floor. I don't race myself from streetlight to streetlight.

I went 6000 miles on the original oil before I had the dealer change it with whatever they gave me for my free oil change. I had them rotate the tires at 6k too. I babied it during the break in with the occasional high speed stomp every once in awhile. I run 34-35 psi cold on all 4 tires. And my car is FWD and not AWD. And I remote start it for 5 or so minutes every morning before work and then for about 3 minutes as I walk to the car after work.

These are all the things I KNOW I do. Maybe I'm just lucky. I'm sure general consensus around here would say I'm doing everything wrong and I should be getting crap for gas mileage. I'm ok with that. I like my car. It runs great. I spent time and effort to try and determine what worked best for me, gas and driving style to get the 22 mpg I currently and almost consistently get.

Let me know when you find another R/T FWD owner that drives as much as I do, in the crappy mixed conditions I do that gets 22 mpg or better.

I can't honestly say I have. And I'm too lazy right now to read through my posts in the "other" gas mileage thread where I outlined things I tryed and what work and what didn't.

I know for a fact I tryed 89. I believe I even went 2 maybe 3 (again I don't recall) tanks in a row, and confirmed that it was either worse or that there was a minimal increase at best. And we are talking .5 mpg or less.

And no I don't use the evic to calculate it, I do it with good old fashioned math.

I run 87. I get absolutely zero pinging or knocking. My gas mileage is consistantly better than with 89 octane. I commute 35 miles one way, mixed city/highway, mixed stop and go. I rarely use the auto stick, and I rarely mash the peddle to the floor. I don't race myself from streetlight to streetlight.

I went 6000 miles on the original oil before I had the dealer change it with whatever they gave me for my free oil change. I had them rotate the tires at 6k too. I babied it during the break in with the occasional high speed stomp every once in awhile. I run 34-35 psi cold on all 4 tires. And my car is FWD and not AWD. And I remote start it for 5 or so minutes every morning before work and then for about 3 minutes as I walk to the car after work.

These are all the things I KNOW I do. Maybe I'm just lucky. I'm sure general consensus around here would say I'm doing everything wrong and I should be getting crap for gas mileage. I'm ok with that. I like my car. It runs great. I spent time and effort to try and determine what worked best for me, gas and driving style to get the 22 mpg I currently and almost consistently get.

Let me know when you find another R/T FWD owner that drives as much as I do, in the crappy mixed conditions I do that gets 22 mpg or better.

I do but I have not been analyzing it yet lol - all I care about is...I put $20 in my gas tank and it goes past 1/2 tank... previously in both of my vehicles, I would put in $20 and get a little less than a 1/4 lol

I only commute 20 miles one way, probably 5-10 miles to get fast food during lunch, then 20 miles back home...out of those 50 miles we'll call it, I would say about 20 is highway...I will see if my mileage is getting any better w/ this 89 crap...

I do remember when I had my stratus though, not sure if it was because of the mods I did to it, but I was getting about 23-25mpg city, probably 30+ highway (original rated 17/25), it was mad crazy... too bad I don't know what caused it :D

So am I wasting money putting in 89...It seems to burn the same, I don't feel any difference in performance...so yeah... :P

lol. I actually did find an article on Consumer Report's website that basically said that the only difference you will see in using a higher octane in a car that can use 87 is that your wallet will be lighter. :)

I think AvengerRT's non-scientific testing shows the same. 0.5mpg difference could have been caused by many things - including, but not limited to, which way the wind was blowing. :gr_grin:

lol. I actually did find an article on Consumer Report's website that basically said that the only difference you will see in using a higher octane in a car that can use 87 is that your wallet will be lighter. :)

I think AvengerRT's non-scientific testing shows the same. 0.5mpg difference could have been caused by many things - including, but not limited to, which way the wind was blowing. :gr_grin:


Or how much fast food I ate that week. :p

Let's not forget that Consumer Reports is biased towards economy vs performance.

So far, we can say that the fuel mileage difference is likely negligible, but we have no measured power or longevity reports.

I didn't by my R/T for economy, I bought it to drop the hammer on it and go from very slow to very fast very quickly. I've I cared about money I would have bought a Smart or a Fourtwo.

Let's not forget that Consumer Reports is biased towards economy vs performance.

So far, we can say that the fuel mileage difference is likely negligible, but we have no measured power or longevity reports.

I didn't by my R/T for economy, I bought it to drop the hammer on it and go from very slow to very fast very quickly. If I cared about money I would have bought a Smart or a Fourtwo.

That's very true. Consumer Reports seems to be biased towards penny pinching. :)That's why I put the disclaimer in there - we haven't found any solid conclusive test results that are backed up by facts. Mostly just what could be viewed as opinions.:)


Smart or Fourtwo... lol

I used to like consumer reports, but lately they seem always be biased one way or another. I thought that wasn't the point lol.

I've seen two cars compared by consumer reports, $600 difference, near identical HP and mileage, and one was a best buy and the other was considered crap. The difference? One was the best buy was Japanese, and the crap was American.

I know there is no advantage to running on a higher octane the the vehicle is designed for. 87 is just fine for me. :) Besides, gas prices are high enough anyway. I wouldn't throw money away on something that wouldn't do any good anyway.

my avenger is still to new to tell a story but other cars i have owned you can tell the difference between the fuel grades high octane=better miles,better idle,smoother accelaration its just 91+ for me baby!

We have 89 octane in IA with 10% ethanol which is 10 cents cheaper then 87. That is what I use.

I only use the standard gas for right now, i will have to have to use a higher octane once i rebuild engine, and get a turbo.

Filling up with the E85 on the 2.7. Loving the fact its only 2.71 a gallon and 91 is over 4.00. Slightly less mpg's but when u drive with a lead foot it really doesn't matter.

I was looking at the chart and I noticed several members using mid-grade and premium fuel in the 2.4L. I would like to know why someone is using a slower burning fuel that will leave deposit over the long run in their engine. Why pay the extra money for a gallon of gasoline that does not benefit your engine at all. The 2.4L does not have a knock sensor that will alter the timing to take advantage of the premium gasoline.

I am running 93 octane in my 2.7 non flexfuel with a chip, a K&N drop in and factory MTV.

I was looking at the chart and I noticed several members using mid-grade and premium fuel in the 2.4L. I would like to know why someone is using a slower burning fuel that will leave deposit over the long run in their engine. Why pay the extra money for a gallon of gasoline that does not benefit your engine at all. The 2.4L does not have a knock sensor that will alter the timing to take advantage of the premium gasoline.

I can tell you...

that I significantly notice the difference between 91RON and 98RON fuels. the pickup is noticeable and I get more KM's per tank. on the country run I recently did with ULP (91RON) I got 490km to the tank and the return was done with Ultimate (98RON) and I got 560km to the tank. Now this could be explained by anything as much as wind! but I think it was the fuel.

however I have recently done some research and it appears that there is no advantage in running 98RON... I am finding it hard to swollow as I know I can feel the difference in the way the engine runs on 98... :4-dontknow:

I can tell you...

that I significantly notice the difference between 91RON and 98RON fuels. the pickup is noticeable and I get more KM's per tank. on the country run I recently did with ULP (91RON) I got 490km to the tank and the return was done with Ultimate (98RON) and I got 560km to the tank. Now this could be explained by anything as much as wind! but I think it was the fuel.

however I have recently done some research and it appears that there is no advantage in running 98RON... I am finding it hard to swollow as I know I can feel the difference in the way the engine runs on 98... :4-dontknow:

I agree with you WestAust, even though i run the Avenger on 98RON only, I vary the fuel grade on my falcon. I use 98 when its cheaper and its true that you do get better milage and pedal response.
Wilst on this subject I get 580/605km out of full tank on the Avenger. Mostly city driving.

I Use What The R/t Is Supposed To Have 89 Oct

I have a Sebring with the 3.5L engine and I use the owner's manual recommended mid-grade 89 octane.

Unless you've done some extensive engine mods and have altered the timing or compression ratio you will not gain one bit of performance by using anything higher than what the engineers have determined is best for your car. I guess there is that placebo effect though. :i_rolleyes:

That Is The Way To Go With The Owners Manual Says

The survey needs to have a entry for: 105 octane E-85 for a 2.7.

I use E-85 and Regular 87

87 and 2.4l.
Just so you know, the higher octane does not mean you are getting better gas.

What about us that lives in Europe.
We only get the Avengers with the 2.0 CRD Diesel

I agree with you WestAust, even though i run the Avenger on 98RON only, I vary the fuel grade on my falcon. I use 98 when its cheaper and its true that you do get better milage and pedal response.
Wilst on this subject I get 580/605km out of full tank on the Avenger. Mostly city driving.

I get about 550Km to 600Km per tank.. Mixed driving, city mostly. I have been driving an Hyundai Accent while on holidays and I am filling the tank every other day! I miss my baby! (Note to Aussies! I was in Emerald VIC and saw an Avenger there! I was so excited! I guess I should go back to WA... My baby has been in the long term car park for a week!)

For optimum performance 89 octane is recommended for a 2.7L V6
mine is flex fuel, i use 89 octane, and i did notice a difference between 87 and 89.

My first tank (when I picked the R/T up) was 87 octane. My second tank, I put in 89 octane (since the manual says the 3.5 can use 89 octane). The engine seems to run better, so she's gotten 89 octane ever since then. I've never put premium fuel in, because without a reprogram, it wouldn't make any difference other than lightening my wallet a little more. :D

Sticking with the manual and using only 89. It's been awhile since I read the manual but I do believe that it even said using higher octane than what is recommended will give no additional benefit.

it depends how much money i want to spend on gas in a given week. E-85 for being cheaper of 87 octane for more mpgs. but now that E-85 is almost a dollar less then regular gas here it almost worth sticking with E-85 i don't know yet havent done the math.

it depends how much money i want to spend on gas in a given week. E-85 for being cheaper of 87 octane for more mpgs. but now that E-85 is almost a dollar less then regular gas here it almost worth sticking with E-85 i don't know yet havent done the math.

I am curious to see the difference in MPG's between E85 and regular unleaded gas.