99 green exec here too...
just took it from Canberra to the Gold Coast. 2 kids, full boot. Got from Canberra to Taree on 3/4 of a tank and then filled up again. Got home with 1/4 tank to spare.. so 1200km on one and a half tanks... not bad. Trippy was telling me 7.5 to the 100km.
In town (GC) I do 9.5 to the 100km, but I travel the highway alot.


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