I feel that I am value minded. I even capture my sump pump water to use on the trees and garden. Not to mention the 1000 gallons of rainwater I have collected. I just hate wasting stuff...
Waste is 1 thing appropriate parts for the car is another. Buying good parts and use it to full potential is not waste.
I do collect rain water, I have 3 large trash cans and collected about 150-200 gallons. In winter months when we have few rainy days I turn off sprinklers a week or two if we have more than 1/4" rainfall. We have 5 gallon bucket in the shower tube to collect cold water before it is hot enough to take a shower.
In winter months we use about 25 gallons per person per day, compares with average of 150 gallons.
I bough all my oils and filters on sale, but so far I stay away from Walmart house brand oil and filter. I think Fram Ultra at $6.50 is a good buy for 15k miles FCI.