I drove 879.3 highway km today (from Normanhurst, north of Sydney, to Melbourne), starting with a full tank and refuelling with 66.2L. Works out at 7.5L/100km, but the dash said 7.1, using 98RON. Next trip I will carry some spare fuel and see if I can beat 900km ... I did see a 6.2L/100km on the weekend, 160km after refuelling, but Sydney traffic destroyed that!