I recently started using a bluetooth obd2 scanner (OBDLinkMX+) in conjunction with their app so I can see the different sensors and pids in real time (This app seems similar to Torque). There is a pid that shows 'Total Number of Misfires' and have only started looking at it the last 2 driving sessions. This afternoon it showed 6 total misfires after a quick 20 minute drive. No codes were thrown and car ran fine showing no symptoms of a misfire. I looked at the data under MODE $06 were you can see misfires for individual cylinders and all were clear. But under 'Misfire Monitor General Data' there was this: I have found this info on another forum for the id's Monitor ID: $a1; Test ID $80 is the "Total Engine Misfire Rate and Catalyst damage misfire rate (Updated every 200 revolutions)". This is continuously monitored by the PCM's misfire status monitor. Monitor ID: $a1; Test ID $81 is the "Total Engine Misfire Rate and Catalyst damage misfire rate (Updated every 1000 revolutions)". This is continuously monitored by the PCM's misfire status monitor. Monitor ID: $a1: Test ID $82 is the "Highest catalyst-damage misfire and catalyst damage threshold misfire rate (updated when DTC set or clears). Monitor ID: $a1: Test ID $83 is the "Highest emission-threshold misfire and emission threshold misfire rate (updated when DTC set or clears) Monitor Id: $a1: Test Id $84 is "Inferred internal catalyst mid-bed temperature" This is a calculated value - not taken from an actual sensor. Has anybody encountered this before? I am running no cats the spark plugs are fresh with probably around 1000 miles on them. The previous time I drove the car it showed 0 misfires. The only thing that has changed is the fuel. I will run this tank down and switch back to what I was using before to see if it changes.