About 10kms/L and better only a 55L in them,
For starters are you using that ethanol crap, cause i did test 2 months after getting my zze122r ascent sedan, results were
E10 fuel = SHIT about 500kms to the tank
95ron petrol = good about 600kms to tank and about 650kms on highway
98ron premium = Excellent 650kms around town and about 700kms highway
note each time i drove for a week on that fuel to make sure it was 99% style of fuel in tank, before filling up and testing
haven't checked her lately, just got a 2 1/4 from Cat back with Resonator and sports style muffler (Cannons are for show offs), and home made Cold air induction system. I got tired of being told could fit 1 to her, lol noobs they are these mod shops!!!
But am going to do highway test again, might see how far i can get from Bris to Sydney.
when i have some pics i will post them, wait scrap that just look at a stock rolla, looks the same, but wait till i pass you on road you will tell the difference!!!!!!