This is from the Ultra Gauge I just stuck in front of the dash. The CAT temperature went from about 600 degrees F to what you see for about 5 minutes or so. Never saw anything on the EVIC. Never noticed any change in fuel mileage or power but I was just going rather slow showing the area to some visitors.
Now you can really see why shutting off the EcoD while a regeneration is going on can give off a smell and heat.