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The specifics depend on, well, the specifics. For instance a TDI has it's best fuel consumption at 90% of it's peak torque at it's torque peak, but other turbocharged or NA diesels don't have the same characteristic. Even the new 2.5L TDIs doesn't behave in the same way, although they're closer to the older TDI than the older TC'ed/NA diesels were.
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