I've been adding 4oz to every tank full since I purchased my car new, in Dec 1994.
It is a Saturn SL2:
** One VERY HAPPY person, with my manual radiator fan switch, Thanks to Wolf's guidance ** 95 SL2, 386,600 Miles..... 40.35 MPG (10 Tank Full Avg) as of Aug 13, '04. Quaker State 10w-40 Oil...