Not a "this week" result, but a change in our vehicle use has borne fruit. This is the second month in a row where we've spent about $400 less than usual.
We live 20 km from the village where we get our mail, library books, and basic groceries. Instead of going in 2-3 times a week, we now go just once a week.
We live 150 km from a small city with groceries and other supplies that are not available in the village. Instead of going in twice a month, we go in once a month and coordinate that trip with a trip to town for mail and library books, cutting out a separate trip.
We live 250 km from a bigger city with yet more selection and supplies and our medical care. We've committed to holding the line on trips only for medical appointments and bundling our other shopping needs into those trips. It remains to be seen if we can successfully eliminate accommodation expenses from those trips.
There are some other things that go into our savings. More research has led to more online purchases of hardware and other non-grocery supplies and those purchases are put off until the threshold for free shipping is reached.
If we can hold the line over the long term, the savings should pay for some other stuff, like installing a heat pump, relegating our pellet stove to very cold weather and backup use. I don't know if that comes with lower average cost of heating/cooling, but it would be less physically demanding, something that will be important if we are to age in place (we're 66).