I've heard of such a related frugal vs cheap example. Specifically, it's OK to use a "buy one get one free of lesser value" coupon at a restuarant, but your tip should be based on the the full amount (after you add in any tax), and NOT the amount after you apply the coupon.
If a restaurant has a promo that an entree or whatever is half off, should the tip be based on the original price, the 50% off price, or would you tip the amount somewhere in between the those 2 figures?
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