Final answer:
The question compares the human body to the fuel system of a vehicle, stating that humans can survive for two weeks without food, equating to skipping 42 meals based on three meals a day. This comparison highlights that the human body's efficiency decreases well before reaching severe hunger levels, unlike a vehicle which can run on a low fuel amount. The analogy also notes that in the past, levels of hunger that are considered unbearable today were commonplace.
Step-by-step explanation:
The question does not seem to relate directly to level I preservation of engines in regard to the fuel system's required state of being at least 95% full for a specified number of days. Instead, the question provided draws an analogy between the human body's need for sustenance and a vehicle's fuel system. This comparison is used to explain how a human can survive without food for approximately two weeks, given sufficient water and shelter is available. Assuming three meals a day, this would mean skipping roughly 42 meals. However, unlike a car's fuel gauge that can show a constant level of performance regardless of being full or nearly empty, the human body's performance varies with the level of sustenance. While the car could theoretically still run at 25% fuel capacity or less, human efficiency and well-being are impacted well before reaching critical levels of hunger.
Considering the analogy, if the human body had a fuel gauge, one might suggest that typically, we tend to replenish our 'fuel' or have a meal before we reach dangerously low levels of 'fuel,' which could be roughly interpreted as eating before we feel extremely hungry or experiencing any negative effects of low blood sugar levels. It is also acknowledged that in primitive times, humans likely experienced levels of hunger that modern society would find intolerable.