Sounds like a good test. I am also testing a volo chip on my wife's 205 KIA Spectra w/2.0L engine. I installed the hho system and the chip at the same time. I know HHO works, so I didn't feel the need to test the chip separately. I'm on my first tank full after the 150 mile calibration, so in another week of so I'll have my first results.
If I don't get the results I'm after, I'm going to try adding an EFFIE in addition to the volo and see what can be gained. Final test will be to unhook the volo and see what I can get with the EFFIE alone.
When I start getting results, I'll start a new thread to report finding.
Good luck with your test, looking forward to seeing your results!
Steve
1991 Plymouth Acclaim 3L V6.
1 dry cells with nineteen 6"x8" 316L ss plates, driven by constant current PWM set at 35 amps (13.3V at PWM). 28% KOH electrolyte. Total measured output 2.5 lpm. Mileage went from 18 to 26 mpg, all city driving (44% increase). EFIE set at .370 and I still need to play with ignition timing.