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A vehicular adsorbed natural gas (ANG) tank system operates as a mobile, dual gas storage/separation system to enable off-the-natural-gas-grid producers of biogas to use, ship, and process biogas for: (a) onboard delivery to engine of on-demand delivery of methane-rich fuel to an internal-combustion engine; (b) onboard separation of methane from carbon dioxide and extraction of unused fuel as carbon-dioxide-rich commodity, and (c) and large-scale, tractor-trailer shipping of biogas to a biogas upgrading plant and separation of methane from carbon dioxide during discharge at the plant. A mobile tank system on a vehicle comprises vessels filled with porous adsorbent and pressure valves; pressure regulators; pressure/temperature transducers at inlet, outlet, intermediate ports; and an onboard compressor/gas extraction pump. The tank discharging procedure for the separation of biogas into methane and carbon dioxide is such that the concentration of methane in discharged gas is at least 10% greater than in biogas.