Too many variables, Balga. Selling a good 06 D3 for a good 2014+ D4 diesel will cost, I dunno, a net $40k I suppose. That pays for a lot of petrol. It also depends on the type of touring. If grey nomadding in settled areas where fuel is readily available, then the relative simplicity of a petrol engine is an advantage. But if you'll be travelling in remote areas and planning on installing a second fuel tank, then diesel makes sense.
In any event, you need to have confidence in your car. Nothing wrong with a well maintained older vehicle, particularly if you undertake your own maintenance and repair. Carry essential spares and a few select tools. If not, get it thoroughly checked by a good Indie at least six months before travelling.
2013 D4 expedition equipped
1966 Army workshop trailer
(previously SII 2.25 swb, SIII 2.25 swb & lwb, P38 Vogue, 1993 LSE 3.9V8 then HS2.8)
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