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You have the right approach avoiding dual-fuel IMO. Mine gets about 4km/litre on 91RON, maybe 10% better on 95/98RON on long trips, and 3km/litre on gas. Only 10c/litre price difference up here between gas/petrol so doesn't make sense running on gas.
30litre petrol sub tank, 75-80 usable litres in gas, means I have to feather it to get 400km range. LPG after hours in regional areas rare and expensive. Sits in driveway most of time. Might've clocked up 10k km in the 5 or so years I've owned it, it's that bad on fuel...
Planning to get gas stripped off it in near future.
My TB45 (265k) has much more grunt than my TD42T(165k) (kinda goes without saying really...) and you don't need an international runway length straight to overtake a road-train, but I think I still prefer the sluggish 4.2... even heavily loaded plus large trailer and hot summer air, it only creeps down to 4km/litre, 7km otherwise.