Nobody said anything about the value of time here, this is about cutting costs and saving money, which is what
@shawn says isn't happening. If I valued my time highly I'd just have everything delivered by doordash.
But it isn't hard for it t work out.
Lets say you take the Fed estimated cost of mileage, which include repair, gas, devaluation, etc - currently $0.65/mile. For most people with a halfway gas efficient car, and people on this board that do their own (or no....) maintenance its way less. I average about $.20.
But anyway....
If you go 10 miles out of your way, 20 miles round trip - which is a LOT of driving around a town, then you expended $13. On a $200 shopping trip that is 6.5%. For us we easily save $13 by selecting the store properly. And that is a worst case scenario. Realistic is probably more like a cost of $.35/mile and 10 extra miles, or $3.50 difference.
We pick stores that are on the commuting path so the extra vehicle cost is probably $2 monthly and the time is minimal.
You said saving money. The value of time is a totally different subject. The monetary value of my time is irrelevant if the equation at hand doesn't have any means to actually collect on it.