A vehicle may include an engine and electric machine each configured to generate motive power for the vehicle, a battery configured to store energy for the electric machine, and a tank configured to store fuel for the engine. The vehicle may further include one or more controllers configured to determine a vehicle drive range based on an amount of fuel in the tank and an available charge depletion energy in the battery.
STATEMENT REGARDING FEDERALLY FUNDED RESEARCH
 The invention was made with Government support under DE-FC26-08NT04384 awarded by the Department of Energy. The Government has certain rights in the invention.