The testing methodology is flawed IMO. While they went to great lengths to calculate fuel usage per vehicle, which is valuable data, when working out the entire cost, you have to factor in purchase cost and maintenance. Given the engine would need servicing every 250 to 500 hours depending on how the unit is configured, and these will be in butt **** now where, the costs involved are significant. As you said, why not a large solar array and battery bank? Would have thought the cost would be comparable but even if it was more expensive with lower running costs and much lower and cheaper maintenance it would play out in the end.


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