What's the transmission? If it's a manual, I'd take the hill and the Pulse & Glide opportunity it presents. If it's an automatic, take the flat road and avoid fuel-robbing automatic downshifts.
I clicked your log and see it's a manual. Take the high road. I do that on my daily commute - I've chosen the hilly route over the flat one. It works in my case.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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