Abstract: A user on-demand fuel delivery system can include at least one fill vehicle having a fuel tank connected to an electronically readable fuel flow meter; and at least one server configured to receive user instructions for refill of a fuel tank, including actual or anticipated location of the fuel tank, and a time window for fuel refill, wherein the at least one server selects one of the fill vehicles and provides route and time information to the fill vehicle for refill of the fuel tank; wherein the electronically readable fuel flow meter provides fuel delivery volume data to the at least one server, and a payment receipt is generated. Interfaces and corresponding methods are also disclosed.