At
  0: eat 1, carry 1 (2 used)
1/2: drop 1 (1/2 in stomach, 1@1/2)
  0: repeat above 9 more times (20 used, 10@1/2)
  0: eat 1, carry 1 (22 used)
3/4: drop 1 (1/4 in stomach, 10@1/2, 1@3/4)
1/2: eat 1, carry 1 (8@1/2, 1@3/4)
  1: drop 1 (1/2 in stomach, 8@1/2, 1@3/4, 1@1)
1/2: repeat above 3 times (2@1/2, 1@3/4, 4@1)
1/2: eat 1, carry 1 (0@1/2, 1@3/4, 4@1)
  1: drop 1 (1/2 in stomach, 1@3/4, 5@1)
3/4: carry 1 (1/4 in stomach, 0@3/4, 5@1)
  1: drop 1 (stomach empty, 6@1)
  1: move 3 miles futher in using previous answer