Just saw this article regarding range tests
If you aren't driving out of range then drive it like you stole it, if you want to. Leave home every morning with a full tank.
On days when you are driving out of range then some things apply, and they are very rarely considered in magazine range tests and are certainly not part of WLTP (which is a combined cycle test - useless for Range)
I assume I will be driving at 75 MPH on the motorway, with no traffic nor roadwork holdups. I will be driving from 100% down to somewhere below 20%, but rarely below 10%. Any start-off-penalty (cold soaked battery / cabin climate conditioning) will be averaged over that journey, and any climate I need for the journey will be at 75 MPH - so for relatively short duration and, as such, not use a lot of energy (per mile). Any shorter journey is a compromise on all those aspects and is never a good indicator of actual range. So ignore any extrapolated test ... if the tester can't be bothered to drive it "from full until empty" then ignore.
If range is tight for that constant 75-MPH journey chances are good that, in practice, I will hit traffic and/or roadworks, and that will increase my range such that "tight" becomes "comfortable". Worst case I will have no holdups and will need to slow down or make an extra charging stop.
Try your range challenged journey in
A Better Routeplanner which has pretty good algorithm for accuracy
Bjorn's videos are useful, but all his tests are a bit on the slow side for UK driving, but he does do constant-speed (conditions permitting) on motorway, so useful comparison model-to-model and brand-to-brand.