full tank can range from 70-90 depending on petrol. i get about 400-450km a tank. i use mine as a daily driver as well currently 250rwkw. but once i finish the tune and cam gears it will be close to 300rwkw. IMO mine has been very reliable as a daily, only times it has broken down was wen i've pushed it to the absolute limit. (ie: turbos & clutch).
for me it feels liek a average car driving to and from work (i drive about 450km a week) but wen u need that quick pull its ready anytime. i think just get a compression/leakdown test done prior purchase, then do a major service and get rid of those ceramic turbos.