Final answer:
The logical fallacy in the example is a biased sample, where the evidence used is biased and leads to unreliable conclusions.
Step-by-step explanation:
The logical fallacy in the given example is biased sample. A biased sample occurs when the evidence used is biased in some way, leading to unreliable conclusions. In this case, the arguer's evidence concerns only breakfast at the restaurant, not dinner, which may have an entirely different menu. Therefore, we cannot draw reliable conclusions about the restaurant's success at dinner based on this biased sample.