The phrase "best diesel" refers to the highest quality or most superior type of diesel fuel available. It implies that it provides better performance, efficiency, and/or fewer emissions compared to other types of diesel fuel. Full definition
I mean, there's a really good diesel compact sedan that gets nearly 50 mpg highway available from a domestic manufacturer. (autoweek.com)
It's a very difficult issue because of how well diesel engines have been made for such a long time, in terms of operation but not in terms of pollution control. (scientificamerican.com)
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