Bf109 oddities

[Erkki]

In the BTR Bf109G6 and G5 have longer range than the 109G2... AFAIK these were practically the same aircraft, G5 = G2 nose "bulbs" and heavier MGs, G6 = G5 with better radio. BTR seems to be correct in that G2 is a tad faster than G5 and G6 with similar climbing(should be tad better climb too), but why do G5 and G6 have considerably longer range? Or is it just game showing G2's range without droptank and G5 and G6's range with the droptank?

The same between 109E1, E3, E4... MG-FF do weight more and thus reduce performance, but that much? Also consider that MG-FF only carried 60 rounds in its drum magazine... Gun and ammo weighted together as much as MG17s and full ammo. Top speed falls, range increases... Why? Nothing changes in power/weight or aerodynamics. Why isnt E7, despite it featured automatic propellor pitch control(unlike E4 during the BoB), more maneuverable than the other Emils?

EDIT: forgot to mention about the G2 vs. G5/G6 cruise speeds.. 310 vs 330, why so?

EDIT2: by no means do I suggest that the game is biased and sucks(heh), but could these details, not important ones but they are there nevertheless, be fixed, or at least rechecked?