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It's probably already shutting off the fuel flow so you don't need to turn off the ignition. Test to see: Engine brake with ignition on, then turn ignition off and see if there's a change in the amount of braking. If there's no change, leave it on and let the automatic DFCO (deceleration fuel cut off) do its job.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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