Ok 2 things.I'm not saying it doesn't... and hence why it's great in large format applications like trunks and farm equipment etc....
But with the ever growing EPA standards not only here but in other parts of the world it's getting harder for these big automakers even to get the same type of performance out of a diesel engine while still lawfully adhering to the clean air standards...
I just think overall diesel may be a dying breed when it comes to passenger cars. It'll be around a long time in other applications, but for passenger cars electric, hybrid and advances in petrol engines have alot more potential behind them, unless VW or another group can come up with new tech that changes the viability of diesel.
Side note: The brand new CEO/President of VW American Region (US, Canada, Mexico) resigned after only 2 weeks in the position... he hadn't even officially started. More setbacks for poor VW.
1) Don't extrapolate what VW did onto other manufacturers.
2) the EPA does not set the rules for the world. Diesel will remain popular in remote areas and lesser developed nations.
he has a point about thermal efficiency, gas engines are in the 25 to 30% range, most diesels are up at 40%. If you want to reduce NOx you can use cooled EGR for a 3-5% trade in efficiency...
Find the balance though, too lean and you get a ton of NOx, too rich and you get black belches.
From what I understand there is still a long way to go with diesel exhaust aftertreatments.
diesels are once again gaining interest from the aviation industry, which is interesting on its own.