Based on your own numbers and Electrify America's current 31 cent per kWh pricing, it saves 30 minutes going 75 mph over 65 mph, and it only costs $6.51 more. Basically, it's a question of how much your time is worth. Also, based on your numbers and starting with a full charge at the national average electricity rates: At 65 mph, it will cost less to make the trip in a Bolt EV than it would to take a 50 mpg gas car with $3.00 per gallon gas prices, so "expensive" is relative.Spent an hour thinking about this.
Assumptions. 500 miles trip. Soc 10% to 55% so as to get the top 53kw charging rate. Efficiency 4.4 miles / kWh at 63mph, and is inverse proportional to square of speed.
Cut away the math equations. Here is the short version of the story.
80mph. 6 charges. 9.2hr. 183kwh.
75mph. 5 charges. 9.2hr. 161kwh.
70mph. 5 charges. 9.7hr. 140kwh.
65mph. 4 charges. 9.7hr. 120kwh.
60mph. 3 charges. 9.9hr. 103kwh.
55mph. 3 charges. 10.6hr. 72kwh.
Conclusion. I will continue to drive at 65mph. 30min more, $20 less. It is pretty expense and time consuming to drive EV for road trip.
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