Additionally, cold weather in December at Navajo resulted in boiler outages which affected refinery run rates. The Tulsa refinery also experienced rate reduction in December due to unplanned CRU issues. During the downtime the Tulsa refinery expects to accelerate maintenance for the East Crude Unit and other units originally planned for later in 2017 and take the opportunity to upgrade catalyst in the CRU with the latest technology. As a result of the planned and unplanned maintenance, HollyFrontier expects crude oil throughput for the 4Q16 to average between 425 000 - 435 000 bpd.