To assess the economic performance of the system, the complete system providing electricity/H2 for mobility was evaluated considering a specific case study, including the biogas plant of Zurich Werdholzli. In this case, the option to completely convert the biogenic CO2 produced from the biogas upgrading plant into synthetic fuels was assessed. This allows, in principle, the use of CO2 as a carbon vector for energy storage, enabling subsequent centralised capture to generate negative emissions linked to the energy use in mobility. In this context, it was highlighted that the additional cost to achieve carbon neutrality and favour the capture of CO2 would be limited to 0.01-0.02 €/kWh of fuel produced. The total cost of the electricity produced from stored methanol or methane would be between 0.192-0.218 €/kWh, while the cost of H2 would range between 0.184 and 0.215 €/kWh. The lowest costs correspond to the use of methane for electricity storage and methanol for H2 storage. Combining the information obtained from the operation time of the system and the calculated costs, one can estimate the average cost of the supply to mobility in approximately 0.096 €/kWh for electricity and 0.112 €/kWh for H2.