Wrong place to pinch your pennies ---> do what the manual says. My '02 says 93 octane, I don't second guess them.

20 gal/week x $0.20 extra per gallon = $4.00/week. Peanuts.

__________________
2002 E320 4-Matic
2008 Subaru Outback
2009 Subaru Forester