Well, I'll take this task up. Found (2) cans of dust covered BG109 in Haddam CT and have run 1 can thru for 15 minutes as instructed (ok, i went a little longer) My consumption can be up to about 1qt / 1k miles and at this point willing to try just about anything to milk another (3) years out of my echo.
I'm @ about 440 miles now; down a bit, but i'm not taking a lot of measurements. If I get to 2K without adding a whole qt, i will be sure it has contributed a bit to reducing consumption.