Tank readings are recorded each time a delivery is made. Only Delivery Type 2 (Keep Full) customers will adjust the Current K-Factor, update tank %, Old DD Reading, New DD Reading, Glns Deliv, etc. The Tank Reading screen also displays bar graphs showing usage over a three year period for gallons delivered and degree days accumulated.
The K-Factor is based off of the last three deliveries, Daily Use, and number of degree days that have passed between deliveries. The Percent K-factor to Change is based upon the setup of the Division file meaning that the K-factor will only change by the Percent to Change (For example, 30%) so that a dramatic effect does not occur.