I'd like to find out too, I doubt 2 octane will make much difference!
My car has been averaging about 7-8km/100km last few weeks and about 750km per tank. Consistently running shell v-power, 70:30 freeway (although freeway is the monash in peak hr, hardly highway driving!)
i use united's and its actually not to bad i get very similar results compared to shell 95 or something give or take a few k's... although my fuel consumption is stuffed i only get around 420-460 a tank lol
Currently i'm getting 11.6 liters per 100km which i think is very heavy for an Euro especially being quite slow and non performance orientated. I'm comparing this to my 05 wrx which is close to 200kw at the wheels and is super quick with lots of mods. Currently i get 12.5 Litres per 100km with the same kind of driving, back and forth to work. I fill both the WRX and Euro with 98 Octane petrol.
Just recently, the Euro is taking a bit longer than usual to start which i think might be battery related.
Just made trip on the weekend to sydney. Return trip got 15.32 km/l (so thats around 6.5L/100km). Thats about 919 a full tank. Reached 833 yest without a fill and could have made it home without a fill but started to get nervous lol. CL9 6MT - BP ultimate.
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