Car2go rentals operate on a pay-per-minute model, which generally includes the cost of fuel within the rental charges. This means that as a customer, you do not need to worry about purchasing gas separately during your rental period. However, it is worth noting that the vehicles are typically provided with a sufficient amount of fuel and are designed to be returned with a similar level of fuel. Should the fuel level be significantly lower upon return, there may be additional fees charged. For the most accurate and current information regarding fuel policies, it is advisable to refer to the official Car2go website or app. This will provide clarity on any specific guidelines related to fuel and rental agreements.