I pretty much agree with all of what you stated. Diesel fuel used to be a bargain. One gallon (US gallon) of diesel had more BTUs of energy then gasoline and cost less. Plus mechanical diesels are/were relatively simple other then the injection pumps. Now? By the gallon, where I live - diesel is nearly always priced higher then regular gas. Modern diesel fuel has less BTU energy then it used to (but still beats gasoline). Modern diesel no longer inherently has adequate lube for mechanical rotary injection pumps. Subsequently those of us that still use them have to hope pump fuel has enough lube additives in it to be safe - or add our own.
As far as direct-injected gasoline engines running in "diesel" mode. Yes, GM and one Japaneses company had such engines in development but none ever made it to the public as far as I know. Last I read, GM was in the middle of development when it went bankrupt and we tax-payers took a huge loss to bale out the company. Correct me if I am wrong, but I do not think the new baled-out GM ever continued the "diesel" engine that ran on gasoline. Personally I'd rather see GM pay us taxpayers back for the money that was taken.
And note - before someone tries to "correct" me. I certainly know what compression-ignition is, as well as what direct-injection is. GM did indeed have an engine in development that did both using gasoline as a fuel.
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