average is usually between 580 n 620, i have a heavy foot too, but only use Premium 98ron, why does everyone uses this dodgy ethanol mix you get less k's, if u want economy use either standard unleaded 95ron or premium 98ron it makes a world of difference, when i 1st got my lil girl i did fuel tests to see what was better!
highway runs between Brisbane and the gold coast so i get even results i did this at night so i didn't cop traffic jams!
plus i spent the whole week running on the fuel i was going to use that week end so there would be a minimal amount of different fuel mixed together
the results are this:
week 1 ethanol 91ron about 580k's not too bad
week 2 unleaded (no ethanol) 95ron about 650k's getting better
week 3 PREMIUM 98ron 730k's BOOYAH
i ran it from full tank to near empty but they are what my figures stand plus on the premium i decided to give her a fair bit on the way back, cause i had driven it like my grandad would on the other times and a dunnydore had to put the hammer down considering he was doing 90km'h in the the far overtaking lane. and i blew past him, i guess he didn't like the fact that a rolla over took him in a supposed non overtaking lane! and my lil girl is totally stock 02 rolla ascent sedan