Even though 87 costs a bit more (maybe 10c more/gal typical) in WA, I tried it over the past several days (just came home from a road trip, tried Texaco, 76-conoco-philips, Chevron and Shell along the way), I must tell you though my wifey's 2AZ-FE simply luvs Shell 87 gas more so than 76, or Chevron. Coincidence? I don't know....I'm too cheep to use anything higher than 87 to begin with. My budt told me that shell offers the smoothest idling and acceleration based on engine vibration during acceleration, rapid lane change,etc. more so than my all time faves such as Texaco or 76 conoco-philips.
Q.