1. #1
    Join Date
    Aug 2011
    Location
    Springboro, Ohio
    Posts
    1,869

    Reccomended octane not at the pump

    Know there are tons of gas threads on here, but I have a bit of a different question. If the manufacturer's suggested octane rating is not available at the time of fill up, is it better on the engine to go up or down in octane rating?

    My gas cap recommends 91, but the gas stns by my house offer 89 and 93. I assume that going to the next highest octane would provide the most stable firing environment, but I'm no expert and would prefer to not waste my money if I'm thinking wrong.

  2. #2
    Join Date
    May 2004
    Location
    Nags Head, NC
    Posts
    3,909

    Re: Reccomended octane not at the pump

    This is totally a personal preference, but I go with the cheapest stuff......I dont think 2 points in octane make a bit of difference unless youre running NASCAR. My jeep has 188,000+ miles on it and it has served me well. If I were you, I wouldnt waste the money.
    Just Enjoy Every Possibility!

  3. #3
    Join Date
    Feb 2009
    Location
    Dayton Ohio Area
    Posts
    5,944
    If your engine has a turbo it likely needs the higher octane. If you run lower octane the engine will knock and the PCM with adjust the fuel air ratio to eliminate the knock. So you'll end up burning more gas. You can pay more for it now or pay more often for it. It is your choice. Was this a jeep question?
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  4. Re: Reccomended octane not at the pump

    You could do half and half :) I'm no chemist, but seems like maybe it would work? haha Octane is also dependent on elevation. Looks like you're in Ohio, so that's not an issue. When you're lucky enough to visit Colorado, you'll notice a lot of pumps with 95 available. Anyway, if I were in your shoes and that was the only gas choice, I'd go up, rather than down. The science nerds at Chrysler have set up your engine to run properly at the suggested octane level. Neither one will make it run optimally, however, going down at low elevations is not something I'd want to do. Probably knock. There's my non-chemist, non-legally-binding opinion :)
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