KOH is much better and won't foul your plates like baking soda. Check on eBay -- there are several that sell 2 pound batches that can be shipped to Alaska. There is one in Nebraska that I've bought from before that I can strongly recomend. Can't remember the exact name, but there can't be very many selling KOH on eBay from Nebraska.
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.