Eruptions of the Yellowstone volcanic system have included the two largest volcanic eruptions in North America in the past few million years; the third largest was at Long Valley in California and produced the Bishop ash bed.
On the diesel Passat, the TDI badge stands for Turbocharged Direct Injection, which isn't really all that helpful as the gasoline-powered Passat is also turbocharged and also uses direct injection. Volkswagen attempts to clear this up by calling this Passat the Passat TDI Clean Diesel.
The 2016 Audi Q5 provides compact luxury suv shoppers with one of the few turbodiesel drivetrain options out there. The Audi Q5 3.0 TDI Premium Plus trim level delivers a 3.0-liter, turbocharged six-cylinder diesel motor that generates 240 horsepower and 428 lb-ft of torque.