I have zero idea how the trip supplement works - I thought it might have been based on distance, then time, then time of day, then day of week ..... nothing seems to make any sense. On the same day within 15 minutes of each order and basically the same distances for each order I can get a trip supplement of .45 followed by a trip supplement of $1.69. Some are even higher. Maybe the supplement is higher for orders that have been rejected by other drivers? Any thoughts on how this works?