Originally Posted by edmorel
not to break balls here here but 1.8% better is a sampling error at best. Also, on time simply means that, on the time that FEDEX scheduled it. USPS can get a 2 pound package from NY to LA for under $5 in 3 days. FEDEX ground can't touch that.
It is not a sampling error - I assume you know enought statistics to know that with their volumes, it is actually quite significant.
I agree there are other measures - UPS does not fair better in them.
If you want the cheapest service - use USPS (actually even FedEx use USPS to ship some packages)
"On time performance" is derived with respect to the promised time (not to the scheduled time).