I just updated the firmware in the LM-1 and did a recal.

I let the car idle until it was in FTC 17 and then recorded a 10min log with EFILive and with the LM-1.
From the LM-1 log the average AFR is 14.66391:1
From EFILive the average AFR is 14.96731:1

EFILive reads .3034 lean at idle.

I am using the PID
AFR = {EXT.AD1}*2+10

LM-1 scale is 0v=10, 5v=20