Tula's fuel efficiency expectations for dDSF are more modest for engines like GM's Duramax diesel—1.5 to 4.0 percent, though CEO Scott Bailey points out that for heavy-duty diesels, 3.0 percent ...

It shouldn’t come as a surprise that production of yet another automotive component is grinding to a halt thanks to the global parts shortage crisis. This time, it’s GM’s 3.0-liter Duramax ...