In case anyone is interested, there's a new trip planning tool being developed for the Model S/X which runs locally on your phone or tablet. There's no direct support for Roadsters (yet), but I found it does a reasonably good job at simulating the Roadster if you select the Model S/60, and override the default "90% range" to be your Standard Mode range * 1.084 (which is 90%/83%, with 83% being what I see as the standard mode charge limit). There are some other tuning knobs to dial things in, after you get some experience with using it. What's intriguing about the app is that it includes factors such as weather, elevation change, and car loads (payload, cabin heat) in the model. When you add waypoints for charging, it suggests how long you will need to charge before departing. No model is ever perfect (or guaranteed!), but if I look back on some trips I took, it predicted the resulting battery SoC within a few %. The app is called "EV Trip Optimizer for Tesla". There's a version for Android in the Play Store, and also for Apple. Digital Auto Guides is the author. I have no formal relationship, but I have been discussing the Roadster with the author, and will be helping him try to make it work for our wards. (No promise on time frame; he says it could be "a few months or so.") Enjoy!