The FICO® Safe Driving Score is based on a rolling 7-day average. It is recalculated every day using the prior 7 days of data. So, if you have several “Very Low Risk” or ★★★★★ trips, which are followed by some “Low Risk” or ★★★★ trips, at some point, the “Very Low Risk” trips will start to drop out of the score calculation and be replaced by the “Low Risk” trips. This means the highest point value scores are being replaced by lower point value scores, which will cause your overall FICO® Safe Driving Score (average) to decrease.