February has 28 days with one extra day during leap years. We want the fewest number of miles, so we go with 28 days in February. The fewest number of days she can walk is $\left\lfloor\frac{28}{3}\right\rfloor=9$. So the fewest number of miles she can walk is $9\cdot4=\boxed{36}$ miles.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Suzanne walks four miles every third day. What is the fewest number of miles she can walk in February?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
36
Suzanne walks four miles every third day. What is the fewest number of miles she can walk in February?
test