Possible scenario for testing a Turbo diesel injected car and what may be manipulated to alter the results.
VW being sneaky.
This illustration is to show the possible ways to manipulate the EPA results.
Possible scenario of the EPA's testing applied to a Generic Turbo diesel engine vehicle or a VW. Lots of ways to cheat or hack the system in a "what if then this situation." Using Road calibration against Dyno calibration mode.