It's possible, but much harder, with an auto. I find the best results with an auto come from keeping steady speed, losing a bit on the uphills and gaining on the downhills, and some strategic engine-on coasting. Find a good speed that gives you just enough power to stay in top gear without downshifting, and don't go much faster than that.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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