I'd go ahead and key back to the "on" position. There's a bunch of electronic stuff you might like to have functioning. Things like ABS and airbags.
I preserve brakes by not using them. You get 3-4 pumps before the vacuum runs out. If I use 2+ pumps, I'll bump-start for a second to restore vacuum, then key off again. That way I have full boost if an emergency appears.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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