One thing that limits the VW TDI (regardless of the car) is its acceleration-oriented gear ratio.
3.89:1 ain't gonna ultimately cut it for big MPG. From what I can see VWs are resistant to gearing changes. Limited gear flexibility is one reason I don't much like front wheel drive.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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