That's not good.In post 19, I corrected the gasoline viscosity from kinematic (cSt) to dynamic (cP) with the Specific Gravity factor of gasoline (approx 0.7), then used the HTHS viscosity of the oil in the calculator, I entered both the oil and gasoline in dynamic viscosity units of cP for consistent viscosity units, and it showed the oil's dynamic HTHS went from 3.5 cP to 1.97 cP with 30% fuel dilution. Fuel dilution of 30% is a lot, and would highly impact the resulting mixture viscosity.
Doesn't the HTHS wear shoot up when the dynamic viscosity drops below 2.7cP?