I just took my first trip beyond the range of the Roadster - 195 miles at mostly freeway speeds. Recharging was a drag. While I put more juice in enroute than I needed, this was my first long trip and I wanted to be safe, not sorry.
It occurs to me that if I had driven more slowly, I might have been able to make that trip without stopping to recharge. Would that have been faster if I'm measuring door to door time?
While I could (and did) drive at a rate of 2 miles in 105 seconds (about 70MPH), the 70amp HPC stations took 210 seconds to put those 2 miles back into the battery. That means once I depleted my mileage store (about 170 miles for my 305 Wh/mile consumption rate) I was effectively traveling at 23 MPH.
So, I get 130 miles (leaving 40 for cushion) at 70MPH and then I had another 65 miles at 34.3 MPH. I'll look at my logs tonight, but roughly speaking the total time for the 195 mile trip should have been about: 130/70 + 65/23 = 4 hours 40 minutes for an average effective speed of only 42 MPH. Now, if I had driven at 50 MPH instead could I have made the trip without stopping, and also have arrived sooner?
I know Tesla has a chart of Wh/mile on one of their web site blogs. Before I attempt it, has anyone else tried to put together a "minimum time" equation for long distance trips that nominally require charging enroute?