Welcome fellow Subaru owner, get a scanguage or equivalent MPG monitoring equipment, that will help boost your mpg since you get realtime MPG readings.
For the downhill sections...if you are REALLY BRAVE and there are NO CARS AT ALL..why not just EOC all the way down the hill. The momentum will probably be enough so you can coast all the way home.
*WARNING, do not engine off coast in situations where you will risk your life and the life of others**
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