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Cadillac ATS General Discussion Forum Discussion, Premiuem Gas Recomended in Cadillac ATS Discussion Forums; Ok so I've had my 2.0 for almost a month now, I've only had to fill up twice. Since it ...
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    ATurboS is offline Cadillac Owners Member
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    Premiuem Gas Recomended

    Ok so I've had my 2.0 for almost a month now, I've only had to fill up twice. Since it says Premium Gas recommended that's what I've been filling it up with. When I bought the car my dealer told me that Regular has is all it required. Since I live in CA and gas prices are sky rocketing yet again I'm thinking of filling up with regular. So I guess my question is how big of a difference is the cars performance if I use regular gas?

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    Dave3283's Avatar
    Dave3283 is offline Cadillac Owners Fanatic
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    Re: Premiuem Gas Recomended

    I've read it results in a loss of 20 hp....haven't found torque info yet, but must be about the same. Knock sensors take care of it, but not good long term.

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    Stevo Supremo's Avatar
    Stevo Supremo is offline Cadillac Owners Connoisseur
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    Re: Premiuem Gas Recomended

    the computer will retard the timing on regular gas and there is a mild HP loss.

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    gohawks63's Avatar
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    Re: Premiuem Gas Recomended

    Here is my perspective on this....

    You bought a premium performance vehicle. If the manual stated regular fuel, then I would say that is what you use.

    If the manual says Premium. Run Premium.

    You paid a "premium" because of the kind of car it is. Why would you cut corners on the fuel it needs?

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    marktanner is offline Cadillac Owners Enthusiast
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    Re: Premiuem Gas Recomended

    Unlike cars like my current CTS-V where Premium is required, in the ATS turbo Premium is only "recommended". It will not make quite as much power, and might even take a very small hit in mileage, but it is considered to be perfectly safe by GM. I read an article about the use of the different grades in such vehicles. It stated that there was very little benefit to Premium during the winter, if it's usually cold, as knock is rarely an issue under such conditions. Conversely, Premium is strongly recommended in the hot summers, and I think altitude as well (due to increased use of boost). Premium probably won't be of much benefit on a long highway trip on cruise, either, unless it's really hilly. Midgrade, if available, splits the difference.

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    thebigjimsho's Avatar
    thebigjimsho is offline Cadillac Owners 10000+ Posts
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    Why guess? Use premium.

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    Rozay619 is offline Cadillac Owners Member
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    Re: Premiuem Gas Recomended

    I bought my ATS on 12/29/12, i have only filled up with premium once, did reallly notice anything different. Lets be honest, 20HP during daily driving isn't going to be noticable, IMO.... I too live in CA, 87 octane was $4.13 this morning, unless your going to the track and need the extra performance don't waste the money!!!

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    CTS2009 is offline Cadillac Owners Member
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    Re: Premiuem Gas Recomended

    If you run Regular you are probably hurting your gas mileage. When an engine retards the timing it is running less efficiently. The difference in costs is around 5%. If it affects your mileage by 1 MPG you just negated your savings and are missing out on the additional performance when you want it.

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    Yplus is offline Cadillac Owners Fanatic
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    Re: Premiuem Gas Recomended

    I noticed a decrease in fuel economy when I tried 89. Can't say the car felt much different, but it was mostly daily driving at that point. It was the only time I had seen an average MPG of 17 over a round trip from work to home. I usually get 19 or 20 with this same route with higher octane. In the east we get 93, which is probably overkill, but there are Sunoco stations (and Valero too) that offer 91 (as well as 93) and it's priced between 89 and 93. I seek those out and use 91 since I'm pretty sure that's what GM meant by "premium fuel" anyway given that California can't get above 91. It's a big racket in the west, since they pay 93 octane prices for 91 octane, and the east pays somewhere between 89 and 93 for 91 octane.

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    thebigjimsho is offline Cadillac Owners 10000+ Posts
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    Quote Originally Posted by Rozay619 View Post
    I bought my ATS on 12/29/12, i have only filled up with premium once, did reallly notice anything different. Lets be honest, 20HP during daily driving isn't going to be noticable, IMO.... I too live in CA, 87 octane was $4.13 this morning, unless your going to the track and need the extra performance don't waste the money!!!
    Great, then! Enjoy your 2.5!!!

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    Rozay619 is offline Cadillac Owners Member
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    Re: Premiuem Gas Recomended

    Quote Originally Posted by thebigjimsho View Post
    Great, then! Enjoy your 2.5!!!
    haha, the 2.0T is miles ahead of the 2.5. I had a 2.5 rental for 5 or 6 days while the dealer fixed my IPC and turbo issue and the two engines aren't even in the same league!!! Does anyone know if the EPA estimates on MPG was done on premium or regular gas???

  13. #12
    tfunk02 is offline Cadillac Owners Member
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    Re: Premiuem Gas Recomended

    Quote Originally Posted by Rozay619 View Post
    haha, the 2.0T is miles ahead of the 2.5. I had a 2.5 rental for 5 or 6 days while the dealer fixed my IPC and turbo issue and the two engines aren't even in the same league!!! Does anyone know if the EPA estimates on MPG was done on premium or regular gas???
    They use premium gas (since it's recommended by Caddy) that doesn't have an ethanol blend. If you are like me, that's impossible to find. I'll never be able to get near the EPA MPGs. From the EPA... "The EPA fuel economy tests use 100 percent gasoline, and no adjustments are made to account for ethanol. Most conventional vehicles using E10 (10 percent ethanol) will experience a 3 to 4 percent reduction in fuel economy."

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    Rozay619 is offline Cadillac Owners Member
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    Re: Premiuem Gas Recomended

    Quote Originally Posted by tfunk02 View Post
    They use premium gas (since it's recommended by Caddy) that doesn't have an ethanol blend. If you are like me, that's impossible to find. I'll never be able to get near the EPA MPGs. From the EPA... "The EPA fuel economy tests use 100 percent gasoline, and no adjustments are made to account for ethanol. Most conventional vehicles using E10 (10 percent ethanol) will experience a 3 to 4 percent reduction in fuel economy."
    Thanks for the info! So would i be correct in saying the higher the Ethanol Level in the Gasoline the worst the MPG??? Doesn't 91 or 93 octane at least for California drivers contain at least 10% ethanol if not more?? Sorry if the questions sound stupid, i'm uninformed when it comes to gasoline vs. ethanol!!

  15. #14
    gohawks63's Avatar
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    Quote Originally Posted by thebigjimsho

    Great, then! Enjoy your 2.5!!!
    Well put. If the extra horsepower isn't worth putting premium fuel, then just save your money and buy the base engine, or buy the 3.6L since that only calls for regular.

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