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Premium Fuel?


This is a discussion onPremium Fuel? within the 1.4L Ecotec Turbo I4 forums, part of the Engine and Performance | Cruze Forumz category!
Originally Posted by 06mistreSS CUDA, that's a great explanation. I do have an update. I DID refuel with premium recently ...

138HP | 148 lbft 1.4L Turbo Ecotec Engine Discussion


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Old 04-17-2013, 08:02 PM   #11
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Originally Posted by 06mistreSS View Post
CUDA, that's a great explanation.

I do have an update. I DID refuel with premium recently and went through my first tank on it. That first fill-up with premium was 11.25 gallons, so about 3/4 of the tank after refueling was premium.

Doing some comparing, since I purchased the car, on seven tanks of regular I have run an average of 27.7mpg. My first tank on premium I got 29.8mpg, so about 2mpg better than my overall average on regular and 0.8mpg better than my previous best, which was also on regular. I'll run premium for a while so I can get a running average on it and go from there. So far it looks like it may pay off, but I'm not going to get ahead of myself. I do notice a slight performance improvement which is nice.
Just to note, my previous best was 29.0mpg (on regular) and that was on the very first tank I went through from the dealership. That drive home from the dealership was mostly higher speed main roads and highway, plus I was driving slow(er) because it was through a blizzard.
Depending upon driving conditions, MANY turbo-Cruze owners find that using higher octane fuel (91 or 93) actually is less costly, but it ALL hinges on their driving conditions...and local price differences.

Also, something else to be aware of: MANY of the "high" octane fuels (93) do NOT contain alcohol, so they aren't a 'diluted' fuel, which means higher energy (BTU) content!
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Old 06-04-2013, 07:11 AM   #12
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So bit of an update. My last three tanks have all been above the 30mpg mark: 30.2, 32.8, and 32.4, all run on premium 93 octane. Those three tanks are the first I've ever run above 30mpg. These were mainly longer highway trips however; city driving was only about 15-20%.

Although, since I've been running premium, I am also seeing a noticeable increase in overall mpg for my typical, everyday driving (35-40% city): my average has gone from mid 27's (on regular 87) to about low 29's (on premium 93). That said, I'd say I'm getting a solid 1-1.5mpg increase running premium.
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Old 06-04-2013, 03:23 PM   #13
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Now, the final question is: how many of those tanks were 100% gasoline and how many were E10-E15? If they were ALL 100% gasoline, you can almost 'bet' the MPG increase was due to the higher energy content of the 'pure' gasoline and NOT due to the engines ability to pull more power & efficiency from the higher octane alone by running more advance (less knock retard).
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Old 06-07-2013, 11:18 AM   #14
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Now, the final question is: how many of those tanks were 100% gasoline and how many were E10-E15?
Couldn't tell you right now, can't say I've ever looked for this. Is this something displayed at the pump, and is this something determined by gasoline company's for use in all their stations or by individual stations themselves?
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Old 06-07-2013, 12:38 PM   #15
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Couldn't tell you right now, can't say I've ever looked for this. Is this something displayed at the pump, and is this something determined by gasoline company's for use in all their stations or by individual stations themselves?
Unfortunately, the answer is "no" to your last questions, as not ALL states require gas pumps 'state' how much ethanol 'dilution' there is in each grade of gasoline. That being said, the 'common' thought seems to be for gasoline (in USA):

• 87 octane = up to 15% ethanol is Federally mandated, so basically E10 or E15.
• 89 octane = sometimes *is*, sometimes *isn't* E10...here in AZ it *IS* E10.
• 91 octane = typically NO ethanol, so is usually G100.
• 93 octane = almost NEVER ethanol, so is G100 for sure.
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Old 06-17-2013, 07:20 AM   #16
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Just posted my best mpg in the Cruze this past weekend: 35.6 mpg (95% highway driving). I have continued to see an upward trend in mpg over the past six fill-ups.
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Old 06-17-2013, 03:53 PM   #17
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Excellent, just wish GM would offer a "retro-fit" 3.53:1 final drive ratio 'swap out' package for us 2011 Cruze owners. The additional 2-3 mpg would eventually pay for itself for people who did a lot of highway driving.
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Old 09-04-2013, 10:26 PM   #18
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Just a bit of an update. I have gone back to running regular for the past 8+ fill-ups; just acquiring more data so I can better determine an average. Honestly I can't say if the premium is a benefit right now since the numbers seem to overlap quite a bit.
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Old 11-21-2013, 12:09 PM   #19
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I have seen a massive difference in my 2014 Cruze running 91 in the summer; especially up obnoxious hills. Being that this is my first turbocharged car and having just bought my Cruze this past summer, should I stay with 91 throughout the Upstate NY winter or will the engine be fine with 87 with the cold temperatures? Any experiences or advice? Thanks!
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Old 11-21-2013, 02:49 PM   #20
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I have seen a massive difference in my 2014 Cruze running 91 in the summer; especially up obnoxious hills. Being that this is my first turbocharged car and having just bought my Cruze this past summer, should I stay with 91 throughout the Upstate NY winter or will the engine be fine with 87 with the cold temperatures? Any experiences or advice? Thanks!
IF fuel economy is more important than performance, then, yes, switch back to 87 octane during the colder winter months...the engine will simply "pull" ignition timing enough to ensure there's no "knocking" with the lower octane grade of gasoline. The Engine Control Module (ECM) computer "tests" the octane content of the gasoline after each MPG-reset and subsequent engine start-up, so it *knows* how much alcohol is in the gasoline even when you have half-and-half mixtures.
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