Not the answer to your question, but i assume that
@electracity was referring to the article which quoted the real-world consumption on the 734 mile journey London-Berlin (which included some lengthy sections of roadworks, so 40-50 MPH at best)
I quite look forward to those in the UK as the enforced frugality means I won't have to top-up Supercharge to get home
"
Stop-start shuffling and prolonged cruising at 50 to 60 mph saw the I-Pace use 28.9 kW-hr per 100 miles (117 mpg-e) for the final 50 miles to our Hannover stop"
"
With an indicated 202 miles of range and 160 miles to go ... long sections under repair and jammed with trucks ... Four hours later, we pull into our hotel’s parking garage ... with 20 miles of range to spare"
So 160 miles in 4 hours = average 40 MPH
"
96 percent, giving us 221 miles of range"
So by my maths 100% would be 230 miles range (as shown on dashboard)
and @ 40 MPH for used dashboard-range of (202-20) = 182 miles they actually drove 160 miles
So that would make the 100% real-world-range 202 miles ... at 40 MPH.
Doesn't "feel right", so either my assumptions wrong, or the journalist's driving style not very frugal
and average 40 MPH was achieved with 50% at 120 MPH