A single load quotes a rate per mile, but revenue per mile (RPM) is the blended reality across all loads and all miles, including empty ones. It is almost always lower than the rates the carrier remembers accepting, because deadhead miles earn nothing and get averaged in.
RPM measured on total miles versus loaded miles tells two different stories. Loaded RPM shows how well the carrier priced its freight; all-miles RPM shows what the truck actually produced.
The gap between RPM and cost per mile is the operating margin per mile. A carrier watching both numbers month to month sees a soft market or a deadhead problem before it shows up in the bank balance.
Example
In a month a carrier bills $48,000 and runs 25,000 total miles (22,000 loaded). All-miles RPM is $1.92; loaded RPM is $2.18. If cost per mile is $1.80, the operation is netting about $0.12 per total mile — thin, and driven by the 3,000 empty miles.
Why it matters
RPM is the counterpart to cost per mile. Comparing the two, on the same denominator, is the fastest read on whether the operation is making money on the truck.