Customers should consider tipping a little more than usual when the weather is bad, when they live far away, or when they place a large order.
My first customer tonight was a $54 order, 5 items in 2 hot-bags. They live 6 miles away, almost to the next town. My average trip is 2 miles each way. And it was cold and snowing (in April!)
The woman answerred the door and remarked, "It's pretty nasty outside isn't it?" She gave me 3 $20's, thought a minute, and asked me for $4 back in change. Leaving me with a $2 tip.
I had 2 customers take advantage of a $10 sale on our extra-large sheet pizza. The first one stiffed me. The second one was on the 4th floor of a hotel just outside our delivery area. He tipped $1.50. Both were pretty discouraging.
All in all I drove 4 hours, took 8 deliveries, drove 35 miles, and made $14 in tips.