Well I don't think there is really a way to do what you want other than killing the engine but you could shift into park and you might use slightly less gas than while in drive. Alternatively you could have your RPM at idle adjusted as low as possible which would use the least amount of gas but it would be a ton easier and cheaper to just turn the car off
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Aiming for 50 MPG from an automatic.
See how I'm doing here, My Build Thread
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