Turbo common rail injection diesel. A VW Jetta diesel already gets about 30/40 mpg, and many hybrids don’t do much better than that.
1999? to 2005 TDI Jettas are easily capable of achieving 50 mpg on a regular basis.
“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.