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Originally Posted by JSH
Cummins is so popular that other manufacturers are dropping out of the market.
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It was quite shocking to me figuring out even Isuzu is now outsourcing some engines from Cummins for its US-spec F-Series trucks.
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Diesel fuel has been more expensive than regular gasoline in the USA since 2007 when we switched to ULSD to allow for particulate filters. On average 18% more per gallon. So yes, diesels get better fuel economy but the economics are about a wash when you pay more for the fuel. Add in the extra cost to buy the engine and the extra cost for maintenance and why would someone that cares about cost / mile buy a diesel?
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In Brazil, even though Diesel fuel was occasionally more expensive than ethanol and CNG, only from 2022 on it became more expensive than regular gasoline. But for heavy-duty engines it's still basically impossible to get rid of, even though I have already seen more dedicated-CNG big rigs in recent years, not to mention some converted to run on Diesel fuel and CNG at the same time.
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Hitting emissions with a DI turbo gas engine will require particulate filters just like for a diesel. (They ecoboost Maverick gets one in 2025) I doubt gas engine buyers while embrace them any more than diesel owners have.
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I used to be more favorable to downsizing until around 2018, when I found out about particulate filters on DI turbocharged gassers...