From: harry@delwatergap.com   
      
   AK said:   
      
   >  I will try regular gas at my next fill up.   
   > See if there is any performance or mileage changes.   
      
   A lot depends on the vehicle, the altitude, the air pressure, the engine,   
   the way you drive, the load, etc., but you won't notice anything different   
   most likely.   
      
   For gas mileage you won't notice a difference because your volumetric error   
   outweighs any theoretical differences between retarding the timing a few   
   degrees under heavy load.   
      
   For performance, unless you're racing, you won't likely notice the slight   
   retardation in timing under load and, in fact, the OPTIMUM performance, I   
   was told long ago, is when you are at the nanodegree of timing BTC prior to   
   knocking.   
      
   Hence it may be easily that you get better gas mileage and better   
   performance, but my first two statements will outweigh them all.   
      
   1. It depends on the mechanical factors, but,   
   2. Almost certainly, you won't notice any difference.   
      
   If you checked timing under load, you might see the difference but most   
   cars, I'm told, constantly change timing so you'd need to compare graphs   
   from different runs (which goes back to my statement that you can't measure   
   the difference with your equipment).   
      
   If I'm wrong, let me know as I don't mind learning from others.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)