See, micro-managing is useful

I considered that.  But it does list an "Alien Cultural Trash -10%" entry in the manuf hover tab, which combines the Benevolent choice (-35% manuf) with the alleged Thin Atmosphere bonus (+25% manuf, +25% food).  So it looks like I'm already getting the "bonus" in my manuf bonus list.

Also, none of my other planets (with +mp% bonus planet specials) have violated the 15.0 bc/mp ratio.  So these two planets are still behaving differently compared to every other colony I've ever had.

Gilmoy,

Not a bug, there is a difference between mp and build cost points.

Lets take the "Entertainment Center" on Riukus II. I am disregarding the non-displayed fractions for clarity sake.

In turn 92 your mp is 12; but you have a happiness of 100%  this gives you a production bonus of 50% which is not included in the 12mp.

In turn 92 your mp is 12; but you have an "Active Core" planet and this gives you a manufacturing bonus of 50% which is not included in the 12mp.

The "Entertainment Center" has no building cost reducing techs, so the calculation is straightforward.

However the "Colonial Hospital" has them: "Efficient Agriculture" (-10%) and "Farm Adaptability Focus" (-15%). And these techs influence not the manufacturing points but the build cost points.

To see it in action - if you have researched one or both of these techs - place a "Basic Factory" on a tile on "Riukes II" and notice how it will require less turns than the equally expensive (30 build points) "Entertainment Center".

So, not a bug, but definitely the interface does not make the difference between manufacturing points and build cost points clear.

In another post i have requested a visual cue to indicate this, so i made a little mock-up of the proposed feature:

Blue: already completed build cost points, green: build points that will be generated this turn.

Edit: Difference was not caused by happiness, Planetary trait was the cause.

Gilmoy,

you are right it is not the happiness that account for the 50%, but the Active Core planet trait. The rest (about the build cost points) is correct.

The improvement list and hover windows show the uncorrected raw improvement build cost. These values are not corrected for building cost reduction techs and show the full cost instead of upgrade costs (when you upgrade an improvement). The "Entertainment Center" has no cost reducing techs and it is not an upgrade, so the shown +30mp results in a build cost of 30, which in turn results in a rush cost of 450 credits.

If i would upgrade my "Xeno Factory" to a "Mega Factory". The hover windows would and does show +67mp. However it is an upgrade and i have building cost reducing tech researched (for a total of -40%), the calculations are as follows:

Earth:

Build cost points = (67 - 45) * (100% - 40%) = 22 * 0.6 = 13.2,
Required mp for upgrade = 13.2 / 100% = 13.2 / 1 = 13.2mp,
Rush cost 13.2 * 15 = 198 credits and the game shows this exact value.

On Eagle I:

Build cost points = (67 - 45) * (100% - 40%) = 22 * 0.6 = 13.2,
Required mp for upgrade = 13.2 / (100% + 25%) = 13.2 / 1.25 = 10.6 mp (actually 10.56 mp)
Rush cost 13.2 * 15 = 198 credits and again the game shows this exact value.

On Eagle I:

Rush cost / Required mp = 198 / 10.56 = 18.75 bc/mp.
Rush cost / build cost points = 198 / 13.2 = 15 bc/bcp.

So my results for Eagle I matches your result for Peti I.

This means rush cost are depended on build cost points, not on manufacturing points required for that build.

Planetary traits are applied after the shown mp calculation.

During the game, from where i have taken these screenshots, i have researched building cost reducing techs (-40% for manufacturing improvements, -25% for population improvements). See the difference between the required building turns, even while the (raw) building cost is the same, namely 30.

Calculated build costs:

• Basic Factory: 30 - 40% = 30 * 0.6 = 18;
• Entertainment Center: 30;
• Colonial Hospital: 30 - 25% = 30 * 0.75 = 22.5;

Earth at 30.2mp 

• Basic Factory 1 turn;
• Entertainment Center 1 turn;
• Colonial Hospital 1 turn; 

Earth at 29.7mp 

• Basic Factory 1 turn;
• Entertainment Center 2 turns;
• Colonial Hospital 1 turn;

Earth at 22.2mp 

• Basic Factory 1 turn;
• Entertainment Center 2 turns;
• Colonial Hospital 2 turns; 

Earth at 17.7mp 

• Basic Factory 2 turns;
• Entertainment Center 2 turns;
• Colonial Hospital 2 turns; 

Eagle I at 15mp.

Can even be lower but this is sufficient to demonstrate the difference with Earth (a 0% bonus planet).

• Basic Factory 1 turn.

Calculated required mp to generate 18 build cost points on Eagle I: 18 / (100% + 25%) = 18 / 1.25 = 14.4 mp;