Armando Kulas

What Octane Rating of fuel should I use?

43 posts in this topic

Hi guys i just need a little info. I just bought a Chevy Spark early this March. I was just wondering if I could use fuel with 95 Octane (RON) instead of the 93 octane rating fuel i use? What are the good and bad effects of doing this?

What octane rating does Chevrolet recommend to be used for Spark?

Share this post


Link to post
Share on other sites
   


euro 95 or 98 BP ultimate i quess

Edited by weetsj

Share this post


Link to post
Share on other sites

Hi guys i just need a little info. I just bought a Chevy Spark early this March. I was just wondering if I could use fuel with 95 Octane (RON) instead of the 93 octane rating fuel i use? What are the good and bad effects of doing this?

What octane rating does Chevrolet recommend to be used for Spark?

Using fuel with more octane rating:

Bad: for your pocket

Good: NONE

It's a small engine with not a very high compression so the higher octane will not be useful at all.

brillo and nicksb like this

Share this post


Link to post
Share on other sites

Friend regular 87 octane works just fine in the spark . 93 octane is for harleys .

Share this post


Link to post
Share on other sites

I can only see using higher octane just being a waste of money.

Share this post


Link to post
Share on other sites

I use regular 87 Octane Rating ever since I bought the vehicle. Don't hear any knocking or anything. Plus, like a few have mention it's a small engine. I wouldn't want to spend more on a higher octane if it could run perfectly on the lowest (cheaper) octane.

Definitely makes a big difference fueling the Spark compared to my Camaro SS <- Damn that thing uses the Highest Octane Premium fuel.

On a side note: I wonder what kind of car would use the Racing Fuel? There is a Speed Way by my area that has that type of fuel on 2 pumps. Octane is like 99 or 100 rating. I wonder, but not tempted to try it at 6/7 bucks a gallon.

Share this post


Link to post
Share on other sites

Its not a race car but it doesnt hurt to run higher octane it burns cleaner as well increases fuel economy!

Share this post


Link to post
Share on other sites

Its not a race car but it doesnt hurt to run higher octane it burns cleaner as well increases fuel economy!

Yes...(for the Spark), it will hurt your checking account and isn't needed.

Having the other car, I can tell you it's a pain to find 93+ in most places (I found one place that has 95 and use it)...but it does get pricey with each fill-up.

Edited by respdoc

Share this post


Link to post
Share on other sites

Higher octane than recommended will make your Spark faster, because your pocketbook will be lighter B)

Smikster likes this

Share this post


Link to post
Share on other sites

Yes...(for the Spark), it will hurt your checking account and isn't needed.

Having the other car, I can tell you it's a pain to find 93+ in most places (I found one place that has 95 and use it)...but it does get pricey with each fill-up.

It really isnt a matter of needs it. yes you use higher octane for a performace car 100+ for a track car... but you can stiil benefit from higher octane in smaller cars improve fuel economy and cleaner burn. I am not saying go to your closest track and fill up no that just stupid but 91 and 93 octance does show improvent in mpg as I have tested in other small cars I own

Share this post


Link to post
Share on other sites

but you can stiil benefit from higher octane in smaller cars improve fuel economy and cleaner burn.

No, I'm sorry but you're not correct. Octane main purpose is for anti-knock properties but in no way (or any credible data exists) that a higher than recommended octane rating increasing "fuel economy" (based mostly on ECU not even being able to utilize the higher numbers).

I do data-log and change my ecu maps quite a bit on the GT-R based on many perimeters (including octane rating). Even then...we are not talking about massive differences in numbers based on just on one or two octane points.

The Spark, of course, is a totally different animal with a totally different engine/ECU setup.

While it might make you feel better....the actual numbers and benefits just aren't physically there (engine/ECU wise) to be had.

Edited by respdoc

Share this post


Link to post
Share on other sites

Why put 93 octane in it? I have a car that requires 93 and I must say I was looking for a car that had 87 for my daily driver. When you put 600-700 miles a week on a vehicle that 50 cents a gallon adds up quickly.

Share this post


Link to post
Share on other sites

The engine combustion must be at a certain temp to ignite a certain fuel. Higher compression or forced induction engines require a higher octane for anti-knock. Sure you can run lower octane in those cars as the ECU can compensate for it. The result is power loss. However, ECU's cannot compensate for a higher octane than recommended. Basically, running a higher octane in a car rated for 87 means that there will be un-burned fuel because the engine cannot ignite and use all of it.

This is one of those automotive myths similar to leaving a pick up trucks tailgate down to increase mileage. They both are false.

Share this post


Link to post
Share on other sites

Until someone comes out with a chip or an HPtune for it, no need.

Share this post


Link to post
Share on other sites

Unless the computer is constantly trying to increase timing advance and listens for knock to know how far it can go. Higher octane would allow more advance if the computer is trying to dynamically adjust. This is something that we just don't know about this car.

.

.

That said, I would stick with 87 since it is so much cheaper.

Share this post


Link to post
Share on other sites

Unless the computer is constantly trying to increase timing advance and listens for knock to know how far it can go.

The only way that would be possible is if the ECU is programmed that way (more aggressive). I am 99.9% sure their stock profile is not aggressive in any way (can't be 100% sure since I don't have access to the maps..but still :) )

Edited by respdoc

Share this post


Link to post
Share on other sites

Yup, would be nice to have access to fuel and timing maps.

Share this post


Link to post
Share on other sites

I doubt Alldata has the info yet, they normally take it from the factory manuals and those are still not available.

Share this post


Link to post
Share on other sites

Well it is a vvt high compression engine (10.5:1). So it can use and may even prefer to use the higher octane. But because it is vvt it is able to arrest spark for lower octane and use 87 fine. I do see a Noticable difference in power with 93 perticularly at take off and at 70+ mph. My mpgs are better due to more hp at take off. Also mpgs stay above 40mpg at 70-75mph which I don't get with 87. So it really equals out cost wise. Just up to you in what you want spend up front.

Share this post


Link to post
Share on other sites

My 2013 LT 1 automatic seems to run best on the 90 octane plus I can feel a difference in power and less low rpm hesitations than with 87 octane regular but 93 octane super is no improvement in my car .. But with my older Chevys some cars same car same motor was more sensitive to the gas you put in ... I guess put in what your car runs best with that's what I do ..

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now