I know that, so next I will do a proper comparison using 91/95/98 RON over multiple tanks.
BTW I use exactly the same pump set at the same Mobil every time. My point was more that when I had my previous car using Mobil Synergy 98 RON significantly improved my efficiency and performance over Mobil 91 RON.
I got up to 100 more kms from a full tank at times.
My question is why would you increase the operating costs of your vehicle by using 95 RON or 98 RON on an engine designed to run on 91 RON. you will find it will make very little if any difference to fuel consumption.
I have used 91 RON exclusively on my Civic and to my knowledge no one can get close to my average fuel consumption, but i dont drive in the city.
Before my service i was getting 400km to a full tank with 5 ltrs left in the tank.
now after changing oil to royal purple, oil filter, spark plugs to iridium and cleaning k&n filter. now getting 450km out of a full tank with 5 ltrs left. In an EK4.
The other day in my '07 VTi-L i got 545k's on 35litres = 6.42l/100k. I thought that was pretty good. About 100k's of that was highway driving. Mostly going around 60k's though, and a few traffic jams. I thought i would test out that 'keep it under 3200revs to keep i-vtec on'.
When i was only getting 300km from 33L i was like eh wtf? I let the car run as close to possible try as i could. When i filled it up, put 39L in... Ever since then i been busting out 400km's per 33L...
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