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Good domestic 6 cylinder engines are going the way of the do-do. The Dakota uses the same 3.7 V-6 that Jeep uses in the Liberty, and, starting this year, the Grand Cherokee. It's nowhere near as good an engine as the old in-line 6. It won't save you that much in mpg over the 4.7 V-8.
Fuel Economy (city / hwy): Rear-Wheel Drive
3.7L 210 hp V6 4.7L 230 hp V8
4-Speed Automatic Overdrive 16 / 22 mpg N/A
5-Speed Automatic Overdrive N/A 15 / 21 mpg
6-Speed Manual Overdrive 16 / 22 mpg 15 / 21 mpg
The 6 saves you one mpg and probably won't hold up as well as the 8.
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