[knorby]

If the EPA had to tackle the problem standalone, then, sure, the scale wouldn't make it sensible. It could end up influencing whatever regulation goes into cars to prevent this sort of dishonesty in the future. Perhaps cars will need to start logging to a black box of sorts to track engine related settings, or emissions will need active monitoring and logging.

It is also worth noting that the hobbyist solution has the potential of becoming widespread. If VW merely does a software fix, more than a few owners with suddenly sluggish cars might look into the devices. There is nothing specific about 'rolling coal' by trucks...most uses of the devices are purely for performance tuning.