Quote Originally Posted by yebo View Post
i used to fill up exlusively with caltex diesel. when unioil's euro4 came i switched to unioil. especially when the s&r discount came i filled up only with it. but i had over the past year observed my fuel mileage slowly going down. when i last filled up with unioil my city driving was down to only 5.3 km/l. this used to be 8+ km/l when the vehicle was new (albeight with smaller tyres). i was justifying this low fc to the worsening traffic everyday.

by chance i had to fill up and i happen to pass by a caltex station. not wanting a full tank (and still stubornly lookig for a unioil station) i only filled up p1k worth of diesel. as is my habit i reset the trip computer to zero. susrprise, the fc went up to 5.6 km/l. so after a few days, curious if it was just a mistake of some sort, i filled up again to full tank. this to further dilute the 1/4 tank of unioil diesel that was remaining when i filled last. i reset again the trip computer. fc was up to 6.2 km/l. this already more than doubly erase the P2 discount given by unioil!

am going back exclusively to caltex. presently overseas now but have asked the c.i.c. to follow through. hopefully it will come near my "new car" fc but i'd be happy even with a 7.
techron cleaning effect?
after a few tanksful of caltex, go back to unioil and see its figures.
maybe you can get away with one caltex every several unioils?