Been away for a week to do some extensive testing with the following setup on my Mazda CX-9
- Double O2 extenders, HHO, FS2 = no gains to slight loss plus CELs relating to O2 flow rates
- HHO and FS2 = slight gain to unchange
- HHO only = same as above
- FS2 only = same as above
In all the above scenarios, I ran a full tank of gas on each setup. One thing I did notice which was a bit disturbing was that the FS2 was causing the engine to knock at low rpms with load. Once I removed the FS2, knock went away. Guess it's time for a Quad EFIE
2008 Mazda CX-9 GT AWD
9 plate dry cell, cooler, twin bubbler, Volo FS2