Estimated savings meant to inform you the likely price differential between a product's Normal Price in the market and its Deal Price at the specific retailer. SmartShopper collects the tracked products' Normal Prices from various retailers (supermarkets & pharmacy chains) to populate their respective statistics. Generally we use the Median of at least of 5 different retailers' Normal Price data to represent the savings calculation basis.
The Normal Price statistics are collected and refreshed every 6 months in the app to ensure the basis for calculating savings is reasonably up-to-date. At any point in time there will not be any Normal Price statistics that are beyond one year being used.
The quality of Fresh Produce items are not consistent among same products in different retailers, it would be unfair to based your shopping decision simply by price alone, unlike the packaged groceries where you can expect consistency. Buying cheapest Fresh Produce items may end up with compromised quality, not shopping "smart" so to speak. Therefore they are deliverately left out in the savings calculation while you can still compare their prices individually.
We take the cheaper Normal Price observed for a product across the same size range so that it runs a lower risk on "over-estimating" savings when the data point is used.
Some products have permanent twinpacks/triplepacks widely sold among retailers and they offer better value compared to their single pack option. For instance Colgate toothpastes, Tropicana Twister 1.5L. Whenever you have selected the corresponding quantities in the Savings Planner and these products' twinpack/triplepack Normal Price statistics are known, the twinpack/triplepack Normal Price statistics will be used for savings calculation to ensure no bias to "over-estimate" a product's savings.
Retailers run different promotion mechanics on the same product all the time: Buy 1 at RMx, Buy 2 at RMy, Buy twinpack at RMz etc. Turning this button on helps you get savings results that are not constrained by your initial selected quantity, whereby you will not miss out on potentially better savings at a higher quantity purchase. Savings Planner automatically helps you select the minimum quantity required to enjoy the best savings quantity for promotion mechanics valid on that day.