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Thread: Is It Bad To Put Premium Gas In A Unleaded Tank?

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    Is It Bad To Put Premium Gas In A Unleaded Tank?

    what can happen if you put the good stuff in a unleaded tank. (Premium & Premium Plus)

    Some people say the gas will burn cleaner and give you increase performance and others say the higher octanes can Fubar your car. Anyone here try it or know what really happens?

    I also wonder what would happen if you fill up your tank with unleaded but then refill your tank with premium... Can that mess up your tank mixing octanes?
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    Meh, gas is gas.
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    Reg/Plus/Prem are ALL unleaded. You seem to be mixed up here. As far as which octane is best for you, check out your user's guide and your engine's compression ratio. If your car is something like a base Corolla LE, it will not benefit from premium. If your car is something like a IS350, using regular is fine but you'll see slightly increased performance and smoothness with premium. Using premium is well worth it in an engine with a higher compression ratio as you'll get optimum performance.

    I use regular gas in my I4, premium for my mom's (10:5:1 compression ratio..not exactly high but there's a noticeable difference between reg and prem gas) V6.
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    I think you meant to say if it's ok to put premium gas in a car that is recommended to use regular.

    Yes you can, but it's a waste of money. Run the lowest octane that your car will run optimally. Many cars today have knock sensors so running regular gas in a car that recommends premium is ok, with reduced performance. Compression is one indication of whether or not you require premium. I believe timing is also a factor. I've never believed that running a higher octane gets you better fuel economy. I've tried this before in all my cars and I get worse mileage running 92/94 in my dd's.

    Case in point, run whatever octane your owner's manual dictates.

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    Toss in every other fill up a bottle of that injector cleaner

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    Quote Originally Posted by Bonka
    I think you meant to say if it's ok to put premium gas in a car that is recommended to use regular.

    Yes you can, but it's a waste of money. Run the lowest octane that your car will run optimally. Many cars today have knock sensors so running regular gas in a car that recommends premium is ok, with reduced performance. Compression is one indication of whether or not you require premium. I believe timing is also a factor. I've never believed that running a higher octane gets you better fuel economy. I've tried this before in all my cars and I get worse mileage running 92/94 in my dd's.

    Case in point, run whatever octane your owner's manual dictates.
    Awesome, pretty much what I was looking for. Its good to hear it from someone who has actually tried it. My car is a 4 cylinder and my roommate is always telling me if i fill up with premium I will get better gas mileage and performance. I didn't see any octane ratio in my user guide and the dealership just said use unleaded gas. I'm gonna look a little harder and look into the whole octane ratio deal and see if it will give me better gas mileage.

    But what about mixing octane gas. For instance if I fill up my tank with unleaded then turn around and fill it up with premium is it going to mix the octane and give me a problem or hurt my engine?

    Thanks

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    Quote Originally Posted by T-MoJoD
    Awesome, pretty much what I was looking for. Its good to hear it from someone who has actually tried it. My car is a 4 cylinder and my roommate is always telling me if i fill up with premium I will get better gas mileage and performance. I didn't see any octane ratio in my user guide and the dealership just said use unleaded gas. I'm gonna look a little harder and look into the whole octane ratio deal and see if it will give me better gas mileage.

    But what about mixing octane gas. For instance if I fill up my tank with unleaded then turn around and fill it up with premium is it going to mix the octane and give me a problem or hurt my engine?

    Thanks
    Higher octane gas has a higher flashpoint so if your car has preignition or pinging you should switch to a higher octane.
    I have read that higher octane fuel can couse carbon buildup over a long period of time. Just use the high octane if you need it becouse your car is pinging or if it is recomended for your car.
    Mixing gas (octane) is ok.

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    the only time you would have to use premium is if you mod your car by installing a supercharger or turbo. I've got an old corolla and it makes no sense using premium. As long as the gas is unleaded, using the lowest octane is good enough.

    Like what others have posted previously, if you experience pinging, switch to a higher grade unleaded fuel or you could try pouring the fuel injection cleaner every other fill up.



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    If you've got a turbo on your car you should use premium. Otherwise stick with regular.


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    u should only buy premium gas if the car needs it to perform.

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    What does your manual say? Go with that. End of story.

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    Quote Originally Posted by paul34
    What does your manual say? Go with that. End of story.
    nicely said

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    Quote Originally Posted by theantidote
    If you've got a turbo on your car you should use premium. Otherwise stick with regular.
    sigh.... sniff sniff...
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    Quote Originally Posted by angel_wing0
    nicely said
    +1. Look at the manual since sometimes car with high compression engines need premium that arent turboed or supercharged.

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    Quote Originally Posted by WoNGsTeR
    sigh.... sniff sniff...
    same...i m actually thinking of changing my car if this gas trend persists.

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