Electric road trip from Seattle to Mount Rainier

In August 1919 a Detroit Electric EV made a promotional trip from Seattle to Mount Rainier. It's now 99 years later, and I decided to set out in a Tesla Model 3 Long Range to see if modern electric vehicle technology can do the same.

99 years later seattle to mt rainier.jpg

Precautions

The goal of this trip was to see if it is possible to reach the Sunrise Visitor Center and make it back to civilization without getting stranded on the side of the road in the middle of the wilderness. Since charging infrastructure is extremely lacking around the mountain I took some precautions to avoid running out of juice.

The aero wheel covers were put back on the car to improve aerodynamics, the tires were pumped just past their recommended pressure to lower rolling resistance, and Chill Mode was enabled to compensate for my lead foot. I left downtown Seattle with the battery charged to 99%.

Click to enlarge map

Route and efficiency

The route I took included a detour to pick up my brother at Seatac Airport, and then to the Weezer concert at White River Amphitheatre, before ending the first day of driving at a hotel in Puyallup. There was no charging at the hotel, so early the next morning we set off up the mountain with battery capacity at 77%.

Tesla's navigation indicated that we would reach Sunrise Visitor Center at 1950 m elevation (6400 ft) with 30% remaining. Surprisingly we actually made it there with 41% remaining, having used 220 Wh/Km (353 Wh/mi) on the 114 Km (71 mi) drive from Puyallup.

While we enjoyed the views and mountain air for a few hours, we knew we were quite literally not out of the woods yet. Would the 41% battery be sufficient to get us to civilization?

 Energy consumption went negative on the way down the mountain

Energy consumption went negative on the way down the mountain

We decided the next leg of our trip would be Route 12 south of the mountain, to the Centralia supercharger. As it turned out we needn't have worried about range. The regenerative breaking worked wonders on the way down and we arrived at the charger with 19% remaining in the battery, having used only 76 Wh/Km (122 Wh/mi) on the 195 Km (121 mi) drive from Sunrise Visitor Center.

 Supercharging at Centralia, WA

Supercharging at Centralia, WA

After charging up at Centralia it would be no problem getting back to Seattle, so we declared the experiment a success at this point.

Road Trip Statistics

The stats for the full drive Seattle > White River Amphitheatre > Puyallup > Sunrise Visitor Center > Centralia ended up being 417 Km (259 mi), using 80% of the battery at a reported 133 Wh/Km (214 Wh/mi).

These reported consumption numbers look a little dubious to me. Assuming a battery capacity of 75 KWh the 80% utilization over 417 Km (259 mi) should be 144 Wh/Km (232 Wh/mi). I don't know how to account for this discrepancy unless losses while parked are excluded from the reported numbers. We did see 2% phantom drain during the hotel night, perhaps there was more drain during other stops along the way that I didn't notice.

Conclusions

I am frankly a little surprised at the reported efficiency figures we achieved during this trip. In my day to day driving I usually see reported consumption of 150 Wh/Km (240 Wh/mi). We did use air conditioning, but didn't speed or drive aggressively. I suppose the low speeds of the mountain roads helped avoid drag.

Something I hadn't considered before setting off was the lack of AT&T connectivity in the area. This lead to the car's navigation system being pretty unusable for the trip down the mountain until we found a spot with signal. Luckily I had brought a physical map. My brother's T-Mobile connection was superior to AT&T, so we could also use his phone as a navigation fallback.

Instead of heading straight for Seattle we decided to extend our road trip to the Pacific ocean, setting our sights on Westport where we were delighted to find the Cranberry Road Winery, which had a Tesla destination charger.

 Destination chargers at the Cranberry Road Winery

Destination chargers at the Cranberry Road Winery


Referral code

If you are considering buying a Tesla car or solar panels you can use my referral code "kim33408" to sweeten the deal. Details on the linked referral page.

https://ts.la/kim33408

Attributions

Icons used in route map graphic; "buildings" by Blair Adams from the Noun Project, "Airport" by Melissa Ambroso from the Noun Project, "Hotel" by Gan Khoon Lay from the Noun Project, "Mountains" by Alice Noir from the Noun Project, "charging" by Jared Ng from the Noun Project