Postman with an Old Motorbike

A postman needs to deliver several packages in four different cities located in a line as above, and get back to the post office.

However, because his motorbike is old, he can only travel 20 miles with a full tank of fuel. He may, however, fill up his fuel tank in any city. For example, he would plan the trip below. This trip takes 5 stops but is not feasible because he cannot travel 40 miles from city D to the office without stopping.

In a feasible trip, what is the minimum number of times he would need to stop?

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