Though it still lacks EPA certification, the light-duty Ram EcoDiesel shows promising fuel-economy benefits.

That the 2020 Ram 1500 Rebel EcoDiesel returned 24 mpg in our 75-mph highway fuel-economy test is remarkable by itself. But when considered against the 18 mpg returned by its counterpart, the Ram 1500 Rebel equipped with a gasoline-burning 5.7-liter Hemi V-8, the diesel is truly compelling. Its fuel-economy number, however, comes with at least one caveat.
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