Graffi wrote:For your next try at that trip limit your highway speed to 55 mph and let us know the difference. I think you will be very surprised at the result.
I made the trip again last week. I decided to take the Interstate highway, limiting speed. I averaged around 55 maybe 57 mph. Trip north was 43 miles and SOC went from 100% to 55%. That's about 9 kWh used, assuming my battery holds around 20 kWh. Makes sense, as the dash readout averages around 4.8 mi/kWh on highway trips at 55 mph. 43 mi / 4.8 mi per kWh = 8.96 kWh. Spot on!
On return I made it an additional 23 miles to a (free!) fast charger where SOC read 29%. It rained on that return leg. So, let's assume 4.7 kWh average for the 66 total miles to fast charger. 66 mi / 4.7 mi per kWh gives 14 kWh used. 20 kWh available in battery * 0.71 = 14.2 kWh. Close enough.
I made another distance trip a day later. I went 50 miles and used 60% of my charge (81% SOC to 21%). Return was 55 miles using 62% of available charge.
Looks like I'm getting excellent efficiency at around 70 degrees F in good weather. I'm thinking that if I were to use 95% of available (100% to 5%), I could go at least 88 miles at 55 mph, assuming 4.7 mi/kWh and 19 kWh used. My dash is reading 4.9 mi/kWh this month, with a combination of local and highway driving. Also, my odometer just crossed the 40,000 mark, with all 12 capacity bars showing (knocks on wood).