The Environmental Protection Agency has yet to release its official highway, city and combined fuel economy ratings for the 2020 GMC Sierra 2500HD with the 6.6-liter L5P Duramax diesel V8 engine, but ...
A perennial competitor to Ford's Power Stroke V8 and Ram's Cummins turbo diesel inline six-cylinder engines, the 6.6-liter Duramax is one of the most popular diesel powertrains for heavy-duty trucks, ...
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