Well, I just got back from my semi-annual government sanctioned anxiety service. Somehow, I've owned this thing long enough to have gotten my third emissions test. This year, they went back to a two-speed idle test, which is strange since it is the exact same lane that I used two years ago when they managed the shoe-horn the VX onto the rollers. Either the dyno grew in the last two years or the VX shrunk. Osteoporosis, maybe?

The 2-speed idle test is faster, not as strict, and is a whole lot easier on my sanity, since I don't have to visualize the VX falling off the dyno.

Anyway, the results seem to suggest that the VX is getting cleaner in its old age. At the very least, the HC readings suggest that leaving much less fuel unburned. That's probably more a side effect of the different fuel mixtures than anything else, though.

Test 2500RPM / IDLE
HC PPM 30.4 / 11.6 (limit 220.0)
CO% 0.48 / 0.14 (limit 1.2)
CO2% 15.3210 / 14.0520
RPM 2320 / 786 (limit 1350)