This is my very first post on anything money saving. So my apologies if this has been mentioned before.
If food in the oven requires, for example thirty five minutes? Kill the power at 27-30 minutes and transfer the food to the top shelf where it'll finish beautifully.
It's not a lot, but it adds up.
Please be careful with meats, using this method. Make sure that it's properly cooked through, when changing the recommended times and temp.
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