I have an LM-1 and the LMA-3 Auxbox. The LM-1 can record 45 minutes from 6 sensors including the WBO2. The LM-1 by itself does a great job of monitoring and recording O2 but playing back the recorded data loses something without the extra data points. I use the Auxbox to monitor and record O2, TPS, MAP, RPM, and fuel pressure. I can add one more sensor before having to use something like the DL-32 (which can log 32 data points).
Having the extra sensor data is really helpful when analyzing data after a driving session.
As far as mileage, It's hard for me to say. I have no doubt that it is better. Before starting to fine tune my AFR at idle was 10:1 and my cruising AFR was about 12:1. I now have an idle AFR of 12:5 (slightly rich is required for larger cams to idle right) and my cruise and highway AFR is between 14.5:1 and 15:1. I will be taking the car down to Salem OR in August so I'll try to track mileage at that time.
I might have gone with the LC-1 instead of the LM-1 if I were to start over. The LC-1 is a permenent install with a gauge in the dash. It can still data log to a laptop.
Patrick Brown
Forum Administrator