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I would expect a lot more, but then it's probably not all downhill.
Anyways, yes, the car uses more energy going up, but any car does that. You just don't regain gasoline coming down a mountain in a gas car. That is where the difference lies
About 30 times a year I go to a local ski resort that is 65 miles away, up hill all the way. The round trip generally uses 60% of my battery capacity, where I start out at 90% and return home at 30%. This is how the energy is consumed:
Going to the resort I use 50%
For the first 25 miles on the way back I have gained back 10%
At the next 10 miles I am back to the 60% I started the return trip with (having traveled 35 miles returning)
I use an additional 10% for the last 30 miles for the total round trip loss of 60%
Only light regen braking is required unless traffic in front of me requires me to slow down more than the road dictates.