"Now include the AUD1.80/L fuel costs into the life of that car."
While remembering, of course, to include AUD0.30-0.60/kwh for charging the EV (or AUD$6-$12/100km for a typical EV).
where by cheaper you mean slightly more expensive if you compare to public charging stations that are the vast minority of charged miles, and 9x more expensive than charging at home.