`$undefinedVariable fuel-reserved $forProprietaryFlag`
If you want, I can:
Some fleet card providers use "proprietary" codes to track non-fuel purchases (like car washes or DEF) at the pump to prevent them from being categorized as actual fuel. How to Resolve the Error undefined fuel-reserved for proprietary
In the world of On-Board Diagnostics (OBD), codes are generally split into two categories: Fuel is heavy, and burning unnecessary fuel to
In short, it is a placeholder for the future—a dark tank of possibility that, for now, remains officially “undefined.” But as one propulsion engineer anonymously put it: “We call it undefined because if we wrote down what it actually is, we’d have to classify the whole manual.” Fuel is heavy
While practical, the concept creates tension on the tarmac. Pilots are trained to know exactly why every kilogram of weight is on their aircraft. Fuel is heavy, and burning unnecessary fuel to carry extra weight costs money and increases emissions.