Xiao Pang's family has two bottles of oil, one is 1 liter, and the other is 400 ml. Xiaopang's mother cooked. She used up one bottle and two small bottles of oil in four weeks.
1 l = 1000 ml,
(400×2+ 1000)÷(4×7)
=(800+ 1000)÷28,
= 1800÷28,
≈64.29 (ml);
Answer: The average daily fuel consumption is about 64.29 ml.