I changed the oil with the EC30 at about 3,300 miles last weekend (2/15/25). I added about 3/4 of a quart at 2,000 miles and at 3,300 miles I was still full. Wasn't very scientific about it but it looks like an improvement has been made.
For the oil change I put some fresh cheap Supertech in there and a can of BG's EPR which is known for helping to clean piston rings. The throttle on the Mazda is very touchy so keeping it at 1,200 RPM per the instructions for 20 minutes was near impossible so I just let it idle at 800RPM for about 35 minutes.
I then drained out the new oil and BG EPR, which was pretty dark, and put some fresh Supertech back in and I am driving it around a couple weeks to "rinse" it out before the switch to HPL Premium Plus 5W-30.
Next weekend will be the switch to HPL. I'll be keeping a much closer eye on oil consumption to see if all these cleaners have made a difference in oil consumption. If nothing else the engine will be spotless!