I’m not sure I’ve ever seen a UPS driver going less than about 40 mph - usually much faster - even in areas where the speed limit is 25.
In my part of the country, they drive like there is no tomorrow. I suspect it is because they are paid to make all required deliveries along a specific route each day as opposed to working a set number of hours each day.
I’ve always held that when approaching a stoplight with a Corvette in one lane and a UPS truck in the other, get behind the UPS truck, he’s coming off at the green faster ;-)