Wat.
Lol, I just played a round vs a guy called Tuvok. Weren´t your guys running straight into my 42 getting 3 bursts and then throwing their Molotov? Not gonna build a 42 for sure in the future.
On topic: The manpower increase is senseless. The fuel decrease also. Imagine you build a fuel cache early on. It costs you manpower but you get more fuel. Right now there´s less point in building a cache - as I have the same effect already:
More MP spent on cache = more manpower needed for Panther
More fuel available because of cache = less fuel needed for Panther
So it´s more or less like a forced cache if you go T4.