Really?
That's interesting because I thought the main interest in the dongle was to have ABRP know the exact consumption, battery SOC, etc. of the car (automatically and in real time) and thus constantly revaluating the charging stops.
Basically working like a good, native EV navigation system.
Firstly, to use the automatic settings (live SoC, calibrated reference consumption, weather, traffic) and thus automatic reevaluation you need to pay. From what I've read the ABRP navigation experience is not that great either.
Secondly, the variability in consumption is unlikely to be that high, at least in my experience. If you drive at a relatively constant speed (that being the biggest factor when it comes to consumption) then the other factors are more or less negligible. There will be exceptions, like hitting heavy traffic in very cold weather and thus covering little distance while using a relatively large amount of energy for heating. (In hot weather this is not a concern by the way. EV aircons have been shown to be very efficient, and I've experienced this myself - sitting in stop-and-go traffic for over an hour in ~30°C heat I lost maybe 2% charge.)
So far I've always found ABRP to be rather pessimistic, usually arriving at the charger with 10-15% more than configured as arrival SoC. Personally I think that is a good thing, and I don't mind if charging takes a little longer because of it. The ZS doesn't charge that fast anyway that it would make a big difference.
You also have to ask yourself, is it worth going maybe 50-80kms further so that you can shave off a few minutes from your charging time? Maybe if you drive very dynamically and are going very long distance (more than 2 charging stops) the live stuff is worth it. I would argue though that the ZS is not really the right car for that in the first place.
Another factor, at least here in Germany and surrounds, is that most people (myself included) have a subscription with a particular provider for charging. It's significantly cheaper that way. If you "roam" or pay cash you are ripped off, with prices almost doubling in some cases. So for me the choice of where to stop is usually related to this, as well as the services that are available (food, bathroom). A little bit of variability in consumption is unlikely to change that. If need be, as DBedford said, the next charger is never that far away.
For interest's sake, my reference consumption in ABRP is currently set to 204Wh/km and max. speed to 130km/h, as I rarely drive faster. I last used ABRP when it was still a lot colder - a setting of 180-190Wh/km would probably be more realistic/accurate now in summer. I'm about to go on some long drives in August so I'll report back if anything changes significantly.