What are the compression ratios? 25:1? I wouldn’t expect the engine to hold up as long as a spark engine under the pressures required, whatever they are.
Not necessarily true. Diesel engines can and do run for multi hundred-thousands of miles.
The Mazda gasoline compression ignition engine is an 18 to 1 ratio.
The current models that still use spark plugs are 14 to 1 which is the highest in the industry. That’s why my CX-5 gets the same fuel mileage as a Toyota Yaris despite having a bigger engine and being a much larger vehicle.
I get 28.1 mpg in the suburban driving that is driving on Guam
I would guess around 13.5 to one.