More discussion of this topic here:
http://www.insightcentral.net/forum/viewtopic.php?t=9
I tested premium and regular unleadeds on 10 tanks (5 of each) alternating and could not detect a difference in either performance or mileage.
Others tested this (discussed in the Yahoo! forums) with a dynamometer and OBD-II setup and found no difference in power with premium IIRC.
Use regular.
http://www.insightcentral.net/forum/viewtopic.php?t=9
I tested premium and regular unleadeds on 10 tanks (5 of each) alternating and could not detect a difference in either performance or mileage.
Others tested this (discussed in the Yahoo! forums) with a dynamometer and OBD-II setup and found no difference in power with premium IIRC.
Use regular.