Re: Terrible mileage 99 GLE

aspasia wrote:

> QUESTION:  One poster suggested I use high octane (91) gas; said lower
> octane is harmful. This has been argued back and forth FOREVER.  I
> don't mind spending the extra $$$ if there's any serious research
> validating his point.   Is it purely a matter of opinion, or can
> anyone refer to such "serious research"?

I've done two years of serious research tracking my fuel economy.  I 
used only 93 octane for several years before switching to 89.  My fuel 
economy did not change at all.

I imagine under very heavy load there is a difference, but for routine 
driving you will not see anything.

Dave