bullet types effects changed-strange results!

[Luno13]

I don't know if this will account for what you are seeing, but the Spitfire's fuel tanks are in the nose, in front of the pilot, and it has no tanks in the wings.

The Hurri has a tank in the nose, and one in each wing.

The 109 has its tank below and behind the pilot.

So, if you're firing from dead six, there is a reduced chance of hitting the fuel tank in the Spit, but a greater chance of hitting it in the 109.

Secondly, the chance of fuel tank fires and explosions have been reduced overall, to be more realistic. In order to set a tank on fire, it needs to be heavily perforated and streaming a lot of fuel. Afterwards, you have to land enough rounds near the leak to ignite it - all of this takes quite a lot of bullets landing in the same place, and is not very easy to do, even with specialized ammo. Instances of fires are very dramatic and memorable, so you hear about them a lot, but they didn't happen that often.