Sorry for the confusing elevation graph. The graph is just 1/2 of the total ride (outbound). So at the turn around, it is uphill for half of the return ride. But, I get your point half of the outbound and half of the inbound will be downhill, so minimal power output. It's the two uphill sections that will burn lots of power (battery and legs).Hey, I believe if the second half of your ride is essentially downhill, you won't have to worry! But you certainly don't want to run out of juice with significant uphills left. The Atlas is a joy to ride, but I've pedaled it at zero pedal assist and it's not very fun. I have 480 miles on mine and I've been charging it about every 50 miles with 20% battery remaining. Mostly flat paved trails and PAS 1 has been more than adequate. I'm really impressed with the range compared to my previous Aurora which was about every 30 miles with one bar left on the battery.