(You can calculate it using the last two columns.) In other words VAS 10W-30 uses a lower-quality base oil such as Group III as opposed to a higher-quality base oil such as Group III+ or GTL in VAS 5W-30. VAS 10W-30 has a lower base-oil viscosity index VI than VAS 5W-30 according to the calculator. What other basic "summary information" can be concluded from comparing this group of oils to each other?
So is it the higher VII Content in the 10W-30 that is lowering its HTFS? It looks like the 5W-20 would protect better for wear than the 10W-30 since its HTFS is greater than the 10W-30. Looking at the HTFS = BO DV150 column, it's happens to be rating them from low to high HTFS, with the 5W-30 giving the largest HTFS value. So I grabbed the Valvoline Advanced Full Synthetic section from your table - see below. I don't think there is a need to run a 15W-40 with a very high HTFS unless the engine is prone to wear, and most people would be OK with the recommended viscosity, and they can have an extra degree of assurance against wear by picking an oil of a given OEM recommendation with a higher HTFS (= BO DV150).
So, basically pick an oil with a high HTFS viscosity (= BO DV150) to help reduce the engine wear. Therefore, minimizing the engine wear and maximizing the fuel economy contradict each other. For better fuel economy, you want to minimize the HTHS and also maximize the effective VII content (= minimize the A_Harman index), in other words minimize both the HTHS and HTFS, which also means maximizing the viscosity index VI since you're maximizing the VII content.For less engine and turbocharger deposits, a smaller effective VII content (= a larger A_Harman index) might help.For less engine wear, you want to maximize the HTFS = BO DV150 ( not the HTHS, even though the two are related).
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