If the grill needs to be adjusted above or below 350 degrees, what is most likely the issue?

The most appropriate answer is that the grill is out of calibration. When a grill is not operating at the expected temperature, calibration issues can often be the primary cause. This means that the temperature reading on the grill’s thermometer may not accurately reflect the actual temperature of the cooking surface. Grills should be periodically calibrated to ensure they maintain accurate temperatures for cooking, especially in a high-volume environment like Five Guys where precision is essential for food quality and safety.

Factors such as an old grill or gas supply issues can potentially affect performance, but they may not directly explain the failure to maintain a specific temperature. On the other hand, if the meat is too thick, it could lead to temperature fluctuations during cooking; however, it would not inherently cause the grill's temperature itself to be off. Therefore, calibration is the key factor that directly impacts the grill's ability to hold a consistent temperature like 350 degrees.