GTP 101: Maximum Stint Energy and Virtual Fuel Tank
The most confusing aspects of the new hybrid IMSA GTP regulations involve the Maximum Stint Energy formula and the concept of the Virtual Fuel Tank, both of which govern how long the cars can run between pit stops and what takes place during a pit stop.
Marshall Pruett
The 2026 season marks Marshall Pruett's 40th year working in the sport. In his role today for RACER, Pruett covers open-wheel and sports car racing as a writer, reporter, photographer, and filmmaker. In his previous career, he served as a mechanic, engineer, and team manager in a variety of series, including IndyCar, IMSA, and World Challenge.
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