I feel like a lot of the calculations for "petrol is cheaper" don't take into account the fact that diesel can be found for 30c/L cheaper than the big petrol station price at truckstops, McKeowns etc.
My box-shaped 3.4 litre diesel 2 ton Landcruiser with 31" all-terrains is cheaper to run on fuel and RUC than my 1.6 petrol Corolla. Servicing and parts costs no, but the Corolla couldn't get me up the Rangitata so not really relevant to compare anyway.
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