I've been getting 450km from 60L city driving over the past 2 years. (twin turbo 1jz, fmic, 3in exhaust) I can probably count on 2 hands the amount of times I boost it per tank (1st gear to the end of 2nd) so it's not that spirited driving really..

My trips from Melb to Adelaide i get about 520km from 60L.