Yes -- everything that Ben & Carter said. All good advice.
I have a bid in on a small fleet of PU trucks, a mix of chevy, ford and dodge. I don't usually do gas vehicles, but business is business. I plan on doing some with the Volo chips and some with EFIEs. Should be a great side by side comparison oportunity. IF I get the job.
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.