The radiator argument is dumb. You guys are trying to infer cooling system capacity from the sheer size/volume of the radiator. Nevermind that those radiators are made of different materials, have different fin counts, are mounted in front of different fans, are behind different condensor cores, are behind different grills, are surrounded by different shrouds, have different coolant flow rates, have different system capacities, are hooked to differnet engines, some are equipped with trans coolers, some with ps coolers, and on and on and on. Too many variables.
Want a meaningful measurement? Find two rangers that are essentially the same, but one has been butchered up with an e-fan. Clean off the radiators and put them both under the same load and see what temp drop you get across the radiators. Lower temp drop==lower cooling capacity.
As for e-fan CFM of air, I don't have numbers, but you can compare them with a rag test. Throw a rag against the front of the radiator, the e-fan vehicle won't pull the rag as hard as the mechanical fan will at driving RPMs.