You are exactly right Phill. That is why next week I am ordering parts (tanks, PWM, Power supply) to set up a couple of long term test for my cell design, now that I'm satiffied with the design. I will set up two identical units -- one running as a "loafing" amperage yeilding 2 lpm and one running at a "working hard" amperage yeilding 3.5 lpm. They will run 10 hours a day, 5 days a week, with monthly disasemble and inspection. The objective of this test is to determine cell life at the two power settings.
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.