Carnegie Mellon University has released a study of diesel engines that show they recuperate their extra cost quickly.

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BorgWarner now supplies the latest generation of variable turbine geometry (VTG) turbochargers for the newly developed 1.6-liter four-cylinder common-rail diesel engines. Bosch has returned to its growth course, and has already regained the level of sales seen in 2007, before the crisis. Cummins Inc. will sell its exhaust business to Global Tube so it can focus more on core business, the engine maker said Tuesday.

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With Volkswagen’s introduction of the XL1 at the Qatar auto show, does it mean an hybrid-diesel car is now viable or does it just mean simply more dreaming? The German automaker claims that its Formula XL1 concept is capable of delivering over 260 MPG.