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Is this right?
...at certain levels, yes.
It requires a bare minimum of fighter 11/rogue 1, however.
EDIT: Well, kinda yes. The character in question would still count the armor as medium armor for the purposes of class abilities that are lost by wearing medium or heavier armor - specifically evasion and improved evasion. (Though that takes us up to fighter 11/rogue 2...)

stringburka |

Is this right?
No, a fighter of level 3+ wears it as medium armor that he can move in up to his normal movement speed and at levels 3, 7, 11 and 15 the ACP is lowered by 1. A 15th level fighter thus wears it as medium armor that allows full movement speed with no ACP.
EDIT: With a certain trait it's at a minimum level of 11, though.

Remco Sommeling |

no, mithral fullplate counts as heavy armor for proficiency and is treated as medium armor otherwise.
From the top of my head fullplate has a -6 armor check, reduced by 2 for being mithral and 1 more for being masterwork. So that would come down to an ACP of 3.
The fighter rogue would be proficient by virtue of his fighter class so he won't take the penalty on attack, but he gets the ACP on several skillchecks and he can not use evasion.
Though ofcourse if the fighter has armor training 3 he'd indeed have no ACP on skillchecks, but still couldn't use evasion in medium armor.

Sniggevert |

Is this right?
In general it would count as medium armor with an ACP of 3. Mithril reduces the class of armor by one factor (i.e. heavy to medium and medium to light) and ACP is lowered by 3 (regular full plate is ACP of 6).
Fighter's armor training can increase your movement, and lower the ACP, but it wouldn't make the armor count as "light" I don't believe.

Purplefixer |

He loses nothing for mithril breastplate, making it the most superior armor on the market for the Non-Heavy Armor Wearer, who would only consider Adamantine Full Plate, or Mithril Full Plate to keep certain specific (barbarian or ranger) class features.
In the high end game, these are really the only armors worth wearing, unless you want a specific armor for a conceptual or tactical advantage (angel chain, etc).

Bruunwald |

Though reading the fighter entry, I see how these conclusions are legitimate as written, my cheese alarm is still ringing loud and clear.
Some part of me thinks the reduction in ACP for a fighter was meant for fightery things only, not roguish things.
Though I won't argue with these conclusions based on what the text says, I do think it's worth noting that likely the spirit of the rule on a fighter's ability to handle the ACP was not intentionally meant to allow him sleight-of-hand checks without penalty.
I'm not saying it doesn't - by RAW it does - I'm just saying that looks like an oversight to me.
It's in the same vein as how a druid taking levels in fighter does not get to ignore the restrictions on what materials he can choose for armor.

stringburka |

Though reading the fighter entry, I see how these conclusions are legitimate as written, my cheese alarm is still ringing loud and clear.
Some part of me thinks the reduction in ACP for a fighter was meant for fightery things only, not roguish things.
Of course not. The number of "fightery things" that are affected by ACP is very small, and it's an issue already that fighters have little they can do outside of combat. At least now they aren't as heavily punished if they want to make, say, a sneaky fighter.
It's in the same vein as how a druid taking levels in fighter does not get to ignore the restrictions on what materials he can choose for armor.
No, it's not the same, because druids have a very specific reason not to use metal armor. Fighters are good at moving in armor because they're trained at it, and as such take less penalty on stuff that requires moving. It's very logical. The druid restriction isn't due to movement or something else that can be trained away.