UPS has amazing telematics on their equipment but the average UPS package truck isn't towing much of a load and honestly, isn't carrying much weight. Gross weights just 16-24k lbs. Gas works for them on a cpm basis. They also can see purchased contract or house service on those vehicles whenever they need it.
Package delivery operating like a hub and spoke from the FC/DC. Linehaul moves within network are moved on diesel class 8 tractors who, when they have problems may not have access to the same facilities. There's a reason why changes in class 8 is from diesel to hydrogen, electric or CNG and not gas.
For the average person, a gas truck probably makes the most sense.
