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If a hill is steep enough, you can coast down it in neutral, which is great. If it's too steep, you'd have to use the brakes, which is BAD for fuel economy.
As for going up, it depends on many factors including stop signs, overall distance, and traffic. All else equal, and given an automatic transmission, I'd guess the long and steady climb is probably better. But you should set your instrumentation to display "gallons per trip", and see what technique and route give you the best score.
Hmm, since the gentle climb is 6km out of the way, I'm pretty sure that's a loser.
Try to take the short, steep climb entirely in 4th gear: start with as much speed as you can, and allow yourself to slowly lose speed as you climb.
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