Update of sorts on this...been averaging around high 12s/low 13s with anything ranging from 91 (which is what I've got in there at the moment) to 98 ULP. No highway driving or longish trips whilst I had the transmission issues, so was all city/town driving.
My current run is up to about 380km, and the fuel needle is a smudge under 1/4. 91 ULP (and it was filled at a 7/11 so it'll be Mobil).
I bought a bottle of fuel system cleaner earlier on in the week to put in with the next refill to see if it has any effect...will probably stick with 91.



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