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What Octane are you filling up with

which grade of gas are you using?

8289 Views 57 Replies 30 Participants Last post by  jandree22
I would like to know what grade of gas you all are using and why. I filled up today with Ethanol 89 octane and thought about getting 87 octane but wasn't sure how good the car runs. I know it increases mpg a little. Can anyone give thoughts or opinions?
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I use 93 always because compared to 87 and 89 it drives noticeably better and has better fuel economy. First started using premium fuel with the Camaro and never turned back.
 

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I've experimented with 87, but the car doesn't like it a whole lot once temps get warmer outside. It bogs from a standstill quite a bit with the AC on. I have found that it likes 87 from the Exxon up the road, but other times I've tried it, it ran like complete crap on other brands. Hesitation was seriously bad.

I usually use 89 octane and feel that my (untuned) Cruze performs just fine on it, or in the peak of summer when it's 90-100 out, I'll use 93. Same reason...that bogging with the AC on is due to timing being pulled because of pre-detonation. It can be downright dangerous trying to pull out into an intersection and the car just won't respond like it normally does.

For me, there is no noticable MPG difference between 89 and 93, but there is a ~4 highway MPG difference between those crummy 87 tanks and 89.
 

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strictly 87 because it's cheaper. 13 eco 1.4 auto ran 122 mph by gps with a bit left on 87. i'd say that's good enough dead stock. oh and the manual says 87 or higher, then goes on to talk about knocking. no knocking on 87 here.
 

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93 octane*.

*: Tuned, so I have to run premium, and premium around me is 93 octane.
 

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Discussion Starter · #7 ·
Well I used to put 87 octane in my 05 cavalier when I had it 2 years ago and I noticed it helped the mpg a little. Not by much but it did. I was going to fill my car up today with the 87 octane but then I was thinking.."Im not sure how well it will run for sure or if my mpg will increase or decrease". Can anyone tell me with their knowledge and/or experience, in comparison, which fuel burns the best to get better fuel economy? I want to see how much more mpg I can get out of my LT. I think right now, im getting 38-39 mpg going right at the speed limit=]
 

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Discussion Starter · #8 ·
93 octane*.

*: Tuned, so I have to run premium, and premium around me is 93 octane.
I think all we have around here in iowa is octanes 87, 89, and 91. Havent came across any 93 yet
 

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I think all we have around here in iowa is octanes 87, 89, and 91. Havent came across any 93 yet
Around me, North Western Indiana, certain gas stations have 91 and the others have 93. Marathon, Luke, and Family Express has 91 where Speedway and Pilot have 93. Maybe try a different station? Really tho it's a negligible figure.
 

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Well I used to put 87 octane in my 05 cavalier when I had it 2 years ago and I noticed it helped the mpg a little. Not by much but it did. I was going to fill my car up today with the 87 octane but then I was thinking.."Im not sure how well it will run for sure or if my mpg will increase or decrease". Can anyone tell me with their knowledge and/or experience, in comparison, which fuel burns the best to get better fuel economy? I want to see how much more mpg I can get out of my LT. I think right now, im getting 38-39 mpg going right at the speed limit=]
Try a tank of each on your car and see how it does. It mostly depends on your driving...I'm a bit heavy-footed and so I'm sure I'm throwing away MPG on 87. The car feels a bit slower, so I push it a bit harder. If you drive conservatively all the time, there may not be a difference.

Turbo engines aren't a fan of low octane gas, so they pull timing and decrease power when they detect knock. This happens often on the Cruze - you can often feel little "pulses" in power between 2000-3000 RPM. Every time that happens, you're throwing away power/MPG.

87 octane does contain slightly *more* power per unit than higher octanes, BUT it has less knock resistance. For engines such as your Cavalier that do not benefit from higher octane by increasing timing advance, they will get the best MPG on 87 since they able to use the engine's full potential on that gas.

93 octane doesn't give you more power persay, but it lets higher-performance engines run closer to their maximum potential by not pre-igniting.
 

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Discussion Starter · #13 ·
Yeah for sure...I usually only go to one gas station here in iowa...It makes it less convenient since im picky lol. I go ot Phillips 66. Idk why I only choose that...I guess its because I notice a the car run better on their 89 octane than places like caseys or kum n go gas. So now I only go to Phillips 66 =]. Anyone have a Phillips 66?
 

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Discussion Starter · #15 ·
what??lol. Are you serious? That's insane. I know there isn't a whole lot of them around, but dang. I would of thought you guys would of come across one. What ironic about this gas station is here in Knoxville at mine for a gallon of 89 octane its 3.79 as of right now...in a town about 2 hours away north of me is another Phillips 66 and their gas for 89 octane ethanol is 3.49 a gallon. I think its apart of the casino and Indians own it so that would make perfect sense because Indians don't pay taxes lol.
 

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I experimented with 85, 87, 89, and 91 (Denver altitude allows many cars to run a lower octane than the rating). I ended up running 91 octane in both my ECO MT and LS. Both cars simply drive much better on 91 octane.
 

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Discussion Starter · #18 ·
Im afraid to ask what anyone else is paying for gas lol. Probably better than me
 

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Im afraid to ask what anyone else is paying for gas lol. Probably better than me
Filled up in Gary Indiana 3 days ago for 3.98/gal. Premium. Lowest they have been in awhile.
 

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Discussion Starter · #20 ·
holy crap. I guess I do have it better to others lol. Hopefully at some point in time, these outrageous gas prices do down a lot more and stay down. This is BS. As long as I have a fuel efficient car, I wont complain too much. All I know is this 3.00 plus is stupid and got old quick lol.
 
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