I have never rented with Avis, but found something odd when trying to make a reservation for ITO -> KOA for 9 days. When pick up and drop off hours are the same, i.e. there are exactly 9 days, the rate was around $380, when I adjust the drop off time to my flight departure by 4h over the nine days, the rate goes to above $450! I don't think I have seen such sensitivity to time at other rental agencies, so I am wondering if this is the rule for Avis.