How full at least should the car's tank be to help reduce moisture in the fuel system and add weight to the vehicle? (What percentage)Answer:

To help reduce moisture in the fuel system and add weight to the vehicle, it's generally recommended that the car's tank should be at least 50% full. This minimizes the empty space in the fuel tank, which can allow moisture from the air to condense and potentially mix with the fuel.

When the tank is fuller, there is less air space where humidity can collect, leading to a decrease in moisture accumulation. Additionally, having a fuller tank adds stability and weight to the vehicle, which can improve handling and traction, especially in adverse conditions.

In summary, keeping the tank at or above 50% capacity is advisable for both moisture management and stability.