GreenKnight121
You listed the total number of gallons externally carried; you didn't specify how much the wingtip tanks carried; and how much the underwing tanks carried.
Regardless, I checked your site, and I did some math and some research of my own. The wingtip tanks could be either 170 gallons or 200 gallons (converting imperial gallons to US gallons); the underwing tanks were 195 US gallons.
I assume when carrying just tip-tanks the plane carried either a 170 or a 200 gallon tank; when carrying all four tanks, the tip-tank was a 170 gallon tank, and the underwing was a 195 gallon tank?