it'll take a while to understand what level of driving drains what from the battery
if you haven't already tried it:
Put destination in SatNav
Use the CONSUMPTION : TRIP to view a graph of predicted vs. actual consumption.
As you drive then if arrival-prediction is below what you are comfortable with (e.g. 10%) then slow down (50 MPH) or plan to charge.
If its a bit borderline then traffic / roadworks may well sort it out for you
Once you have plenty in hand, and recharging is available at destination, and the more so as you get closer to destination (and confidence of arrival %age grows) then you can speed up
Be careful about navigating to Supercharger as that is likely to bring on Preconditioning which will use a fair bit. if you are borderline then change navigation to "somewhere nearby" (e.g. elsewhere in the Services area, or the motorway junction exit point) to prevent automatic precondition (but you will arrive with sub-optimal battery temperature, which may increase charging time). When you are, say, 50- miles out, and if you have some "spare", then you could change SatNav back to Supercharger and let precondition start.
Beware of adverse weather, particularly thunderstorms in summer - pushing all that water out of the way, mile after mile, uses a lot of energy (in ICE too). Other than that SatNav is likely to have a reasonably good prediction (i.e. using current temperature etc.) unless you are towing something big!