“A VW Jetta diesel already gets about 30/40 mpg”
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I hope that’s in town! Volkswagen had a diesel rabbit thirty five years ago that got 51 mpg on the road.
The Jetta's bigger and heavier, and has a 2.0l engine. More like your old Rabbit is the VW Fox diesel, which with the 1.4l engine can get over 60mpg highway.