Diesel engines are more fuel-efficient than HD gas engines — that part is true. But better fuel economy does not mean cheaper ownership. Modern diesel trucks come with higher operating costs: expensive maintenance, complex emissions systems, higher repair bills, and more downtime when things go wrong. If you’re towing heavy weight consistently, the efficiency of a diesel can start to make sense over time. But for most owners who aren’t working their truck hard every week, an HD gas engine is by
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