what you're Try of premium fuel. I think I do more kilometers with a tank with that of the ordinary fuel
I do a 6.2 liters 100km. I tested with fuelly.com
It's a proven fact that you get more bang for your buck with 98.
Three petroleum fuels are generally available in Australia: 91, 95 and 98 (that's in international octane standards btw). The Petrol CX-5 is re-tuned like the US/Canada model and takes 91 in Australia, which is almost identical to the US AKI 87.
To prove the fuel theory, an experiment was done by one of the local car shows to determine which fuel was best.
Tests done in three identical vehicles suited to 91 - each carrying 91, 95 and 98 are driven around a track at identical speeds until empty and their range measured. They are then filled twice with an exact and identical measurement of 91, 95, 98 respectively. And this is repeated twice to eliminate inconsistencies.
The test shows that the first fuel to fail is 91 followed very quickly by 95. The car using 98 lasted a much longer distance.
The cost was calculated for each fuel then divided by the distance travelled.
The end result was that the 98 was the cheapest per kilometre, following by almost identical cost per km for 95 and 91.
Fuel costs in Australia vary the most on 91. So sometimes it can be extremely cheap, and other days it can be expensive. The 98 fuel will also fluctuate, but to a lesser degree.
Strangely, Diesel is almost a fixed price and typically the same price as 98 when it's at its cheapest.
Per kilometre, Diesel would be cheapest (despite being the most expensive per volume), followed by 98, 95 and 91 (despite being the cheapest per volume).