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I'm everyone's been asked this question at least once. But seeing as how most engines made in the past decade are engineered to take both even though a lot of them recommend using only premium. So whats your 2 cents about about this topic?
 

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Just go with whatever the manufacturer recommends. They always have actual data to back up their recommendation. Its not like they have a stake in the gas companies. If that was the case then every manufacturer would only recommend premium.
 

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I would just use premium. Not because people say you get better mileage. Not because people say it makes it run faster. But mainly because most premium gases don't have ethanol mixed in. Also premium gases can remain stable in your tank way longer than regular gas. Meaning if ever for some reason you're unable to start it up for a long time it wont gunk up the fuel lines.
 

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My 2011 CXL Turbo runs better on premium.
 

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I usually use 89 octane. Did a couple hundred mile trip this weekend and used 93 octane. Didn't notice any diffference in performance, but I don't drive the car hard. Only have 1400 miles on the car, so still waiting for it to loosen up. I do really enjoy driving this car. Excellent handling response, decent stopping, quite cabin, great sound system, nice body lines. A little more get up would be nice, but overall, very impressed so far.
 

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My 2011 2.4L reccomends 87 octane and that is what I use. I would not use higher grades than reccomended because it will not improve the performance and it will certianly drain the wallet faster. I have used 87 for 18,000+ miles with no knocking. Use a top tier brand of gas. I get about 22 mpg around town and 30-32 mpg on long highway trips.
 

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Not true, ethanol is in premium fuel also the EPA has allowed the gas companies to increase the ethanol content from 10% to 15%. You can buy non ethanol premium gas if you can find a service station in your area that sells it. Unfortunatley it costs about $1 dollar more than the ethanol content premium. See link to forum below.
http://www.regalforums.com/forums/b...ion/3828-ethanol-blended-gasoline-e-10-a.html

Mike
 

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Premium fuel here. Just got 30.5 MPG average on a 1200 mile trip to Massachusetts and back this weekend. I could never get number like that using Regular.
 

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E85 was $1.15 per gallon cheaper than unleaded today. I filled up my van on e85 for the first time. I'm down less than 1mpg over 130+ miles so far.
 

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I have a turbo .. use regular all the time. Took it on a trip .. kept the speed around speed limit and got close to 34 mpg. Granted it was flat driving with the only hills being the over passes over roads.
 

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I have a turbo .. use regular all the time. Took it on a trip .. kept the speed around speed limit and got close to 34 mpg. Granted it was flat driving with the only hills being the over passes over roads.
Have you noticed any knocking while using regular? Just asking because premium is recommended for the turbo.
 

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No I have not noticed any knocking. But then, I had another issue where there was some chirping/squirrel type noise - similar to the old loose fan belt sound - that I could only hear with the window rolled down.

Im also told that the computer adjusts the timing so there isnt an issue. The car runs fine.

Ive test drove both the GS as well as the ATS and I do like the boost in power. If I had the extra power then Id run premium.
 

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Using regular unleaded in my non turbo 2.4L regal I'm getting 31-32 MPG on the highway and 25 around town thats with summer blend fuel. I started using non-ethenal fuel unfortunately it's only sold as a premium fuel so it's 1$+ from the regular. Slight increase in milage. Regular grade winter blend fuel the highway milage is 28-29MPG around town 21-22. The car has 15K on it so I use the non ethenol fuel to minimize water contamination when its sitting for extended periods.
 

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I have always run Super/Pemium in my vehicles, and it what I currently run in my '12 GS - especially since it's been tuned (GM/Buick Stage 1 kit...).

As for mileage, I dont know the specific numbers. But I CAN tell you the I can go from Albany, NY to Providence, RI and back on a full tank...
 
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