True, my old Volvo boat engine was direct injection, no glow plugs, no battery needed, would start on the handle easily in an emergency. Very low revving though and very economical. The downside of modern very high pressure injection is the need for electronics, OK in a car, but has proved to be a liability in boats. More accurate metering of the fuel is the other big advance.
tdi with double the old 135 bar injection pressure is a great direct injection engine without the staring issues of indirect
 
D4D V6 direct inj was responsive for a diesel. I thought it would be better mpg than a Landy as it’s lighter vehicle but very thirsty and lots of electrics.
 

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