[mwebb]

if you run multiple scan tools
you should run into update rate problems as the ECM can only respond as fast as it can
More PIDs reporting always slows down each PID update rate

for purposes of storing the info / data .
and safety.
you can log the PIDs as you drive and play them back later
with Speedtracer a free tagalong to AutoEnginuity recently updated to version 5.o with the 8.o1 release of AE
and Escan is threatening to release a similar type of FE calculating software in a future release ...