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Proof? Those two documents are 74 and 76 years old and deal with pre-combustion chamber diesels and natural aspiration. Of course adding 10 psi of boost pressure would have made a monumental difference back then!
Today we have direct injected diesels that are already boosted. In a VW 1.9 TDI engine, raising boost levels from what they already are will not increase economy. For example, the reason for the wastegate is to a) allow a smaller turbine for quicker response and better low-end performance, and b)(the relevant one here) to prevent this smaller turbine from over boosting in the top-end and reducing economy.
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