You’re driving down the motorway. You’re halfway through the journey, with a few hours left till you arrive at your destination. It’s been an okay drive so far. Sure, it’s long and has taken up most of the waking day, but the route and plan has paid off so far.
Suddenly, a light starts flashing on your dashboard. The car is running out of fuel. _How can this be?_ The fuel gauge says the tank is…