A few comments from my point of view
- The above covers the 'tail end' of the cost. The biggest cost blocks will be fuel, followed by food/accomodation (depends if you camp), and 'specials' (e.g. a park visit/entry fees/unexpected opportunities/unexpected problems).
- You might be missing vaccinations and possibly equipment (e.g. stand-by medication).
- I don't believe it's possible (nor useful) to plan an overland trip on this level of detail. It will always work out differently, and the time spent planning it could probably be spent better somewhere else. I would recommend to work on rough monthly (or daily) figures. If in doubt, make sure you have some extra buffer (I work with 1k EUR for a big trip), to cover unforeseen opportunities or problems. Then spend the travel time with a focus on enjoying (knowing costs will be ok), than to count pennies all the way :-) I can't give advise on monthly budgets for a car, but I'm sure you'll find seasoned 4x4 in the relevant section of the HUBB. When you take someone else's figures, make sure to account for their vehicle (fuel consumption may be different) and the style of travel (e.g. rough camping vs paying accomodation, as well as the speed - faster is more expensive).
Having said that, enjoy the planning - the journey starts in the mind.
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