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I regularly pulse starting as low as 1200 rpm. My driving is all pulse & glide, as well, so that happens often. Cruising is much lighter load - I sometimes cruise down below 1000 rpm with light load. 175,000 miles and my engine is doing fine.
I like to look at the rpm and gear selection from a miles / engine revolution perspective. The higher the gear you can run, the fewer engine cycles per distance traveled.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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