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A fine explanation indeed. It all makes sense and I think that if an Aero is driven moderately it will run fine on 87 octane, just not at full performance. But then you aren't going for full performance driving moderately. But if one starts to push it, especially in hot weather, there is the potential for damage to the engine, so 91 or 93 makes sense. I think 89 is still reasonable for day to day use even in a stock Aero.

I have run 87, 89, 91, and 93 in my CSE. There is a noticeable drop in performance with 87: it simply won't go to full boost. 89, which I run most of the time, gets full boost and then some (under the right conditons). I do notice a step up when I put in 91 or 93, but unless I'm deliberately driving hard there isn't a lot of practical benefit. Gas mileage for most driving seems pretty much the same between 89, 91 and 93, including on trips.

posted by 24.52.16...

• Car runs like cr*p, need help (long), epwvt, Tue, 18 Jul 2006 02:41:03
  • You should NEVER run 87 in an Aero...., David Ingram, Tue, 18 Jul 2006 07:40:22
  • Re: Car runs like cr*p, need help (long), chuck kusiak, Tue, 18 Jul 2006 07:00:57
  • maybe a solution, epwvt, Tue, 18 Jul 2006 05:25:55
    • Re: maybe a solution, epwvt, Wed, 19 Jul 2006 05:38:25
      • When did you last change the fuel filter?, EricG, Wed, 19 Jul 2006 13:53:24
        • Re: When did you last change the fuel filter?, epwvt, Thu, 20 Jul 2006 05:36:44
    • Re: maybe a solution, JonAero1, Tue, 18 Jul 2006 08:04:10
      • Re: maybe a solution, TML , Tue, 18 Jul 2006 09:26:53
      • There have been confirmed reports..., David Ingram, Tue, 18 Jul 2006 08:14:47
        • Addendum...., David Ingram, Tue, 18 Jul 2006 08:17:27
          • Re: Addendum...., TML , Tue, 18 Jul 2006 09:29:37
            • The owner's manual says..., soneway, Wed, 19 Jul 2006 17:38:55
              • Autobox=87, confirmed, David Ingram, Wed, 19 Jul 2006 19:37:53
          • Yes, the manual and the sticker inside the gas door...., TKC, Tue, 18 Jul 2006 08:24:45
            • Re: Yes, the manual and the sticker inside the gas door, epwvt, Tue, 18 Jul 2006 08:29:41
              • Automatics have the CSE engine...., David Ingram, Tue, 18 Jul 2006 08:44:28
                • Re: FPT knock, BobS, Tue, 18 Jul 2006 10:43:13
                  • Re: FPT knock, Bill Davies, Tue, 18 Jul 2006 12:50:15
                    • Low RPM low load knock, BobS, Tue, 18 Jul 2006 19:27:26
                • Re: Automatics have the CSE engine...., 951Freak, Tue, 18 Jul 2006 09:42:51
                  • Octane=resistance to burning...., David Ingram, Tue, 18 Jul 2006 11:25:39
                    • volatility is probably a separate issue (long), Erik919kt, Wed, 19 Jul 2006 10:50:34
                      • Thanks, I got that wrong...., David Ingram, Wed, 19 Jul 2006 12:59:50
                    • Re: Octane=resistance to burning...., Noel, Tue, 18 Jul 2006 15:05:43 <-- Viewing This Message
                    • Re: Octane=resistance to burning...., JonAero1, Tue, 18 Jul 2006 11:39:27
                      • Automatic?, David Ingram, Tue, 18 Jul 2006 11:51:28
                        • Re: Automatic?, epwvt, Tue, 18 Jul 2006 12:54:25

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