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As some have stated, it's all about the terrain, road conditions, traffic, etc. I've been driving a 2000 Jetta TDI since March of '02. It has virtually no mods and has attained a life time average above 50 mpg. (Over 400 fill-ups, all in a rather detailed Excel Spreadsheet)
I generally shift above 1900 RPMs (peak torque) up to 3000 RPMs. But, I do a lot of shifting in the 2300 to 2500 RPM range.
The Turbo can be "exercised" for working purposes without taking the engine up to 4000 or more RPMs. If you get on it (above 2100 RPM) with a steady push on the pedal taking the RPMs up to 3000 ..........the boost will max for an instant!..... shift and do it in the next gear. That means the Turbo actuator went full range. I've practiced that method and have never had any issues with my Turbo (still original). I do take the RPMs up to 3600 to 4000 at least once per tank of fuel.
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