Have you ever wondered how much of the price of gas at the pump is taxes? I suspect that Oz and NZ are worse. I'm pretty sure that Eurp is.
I know Canada is. Been there.
I'd be careful about that wood gasification thing. I suspect it's hell on an engine.
I get pretty good mileage, but I need a truck to get my tools to jobs. I'll have to heed your caution if I need it.
The good thing about EV's is that they can be recharged. The bad things are numerous. Good luck with the truck.