
I should just shut up but I cannot resist.
So .... you bought an 80K car that is equivalent to a 30K car in size, but better performance and you talk about how cheap it is to fill up.
50K will buy a lot of petrol.
petrol is taxed at 50cents per litre and electricity is not (well 10% GST)
if you had say driven a Mazda 3 equivalent in size to a model 3 for the same distance  then it would have used only a fraction of the 50cents per litre taxed fuel compared to a D3 towing a boat.
A Mazda 3 gets about 7lper 100Km on the highway.
My Google says Melbourne to Port fairy is about 560Km via the GOR so there is no way she would have made it both ways in a Model 3 without say an hour charge.( if in fact you travelled the GOR)
Even at The Mazda 3 would have used  40 litres or less  for the same journey at say  1.40 per litre or $56 or $36 without petrol tax.
So the payback of 50K at say lets be generous 20,000 Km per year is  $2000  so payback time is 25 years. If petrol were not taxed at 50 cents per litre the payback would be around 30 years or so.
Regards PhilipA
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