[cas951]

The ECU will adjust and provide better throttle response and a slight hp gain. Specially with California having only 91 Octane where other states have 93 to 95 octane available. I wouldn't use a tankful of 100 octane but a mixture of 91 and 100 octane to come up with a 93-94 octane mixture. Since you're in Sj you can go to a 76 station located at Almaden Expressway and foxworthy. They have 100 octane available at the pump unleaded.