A car has a fuel tank capacity of 50 liters, and it departs from Shanghai to Harbin, which is 2560 kilometers away, with a full tank of fuel. It is known that the car consumes 8 liters of fuel for every 100 kilometers driven, and to ensure driving safety, at least 6 liters of fuel should be kept in the tank. Therefore, during the journey to Harbin, the car needs to refuel at least $\qquad$ times.
【Analysis and Solution】
From Shanghai to Harbin, a total of $2560 \div 100 \times 8=204 \frac{4}{5}$ liters of fuel is consumed;
After refueling, the maximum fuel consumption before needing to refuel again is $50-6=44$ liters; $204 \frac{4}{5} \div 44=4 \frac{36}{55}$, using the ceiling method, we get 5 times;
But these 5 times include the initial full tank of fuel when departing from Shanghai; therefore, at least $5-1=4$ refuels are needed on the way to Harbin.