When my car was new, i got about 420km/tank. So i guess maybe ur right. Wait til after ur first service if you havent been. And when i got my car from the dealer, it was filled with who knows what. So when i hit the last block, i remember circling a BP station until i thought it was drained down to the last few drop or atleast to close. Then filled it up with 98 BP Ultimate and I have been using this since.