edit:
MorroW's chart is correct and repairing all units, when doing this by only 1 SCV or MULE, takes about as long as making a new unit, Raven being the only exception from this - repairing it is about ~25% faster than making a new one.
MULEs can repair but they do it as fast as SCVs

I don't know if this has been done on sites other than TL. I've used Search but found only RPGabe's [D] Terran Walls and Repair Rates by Building/Unit - very useful thread but not about what I'd like to discuss about.

I don't have a beta key but with certain launchers I can run beta and play against AI (don't know how to patch it though) + Show Spoiler [I'm getting this error] +

The source data for a patch file could not be located. (Patch: "bnet\Battle.net\SWF\MainUI.gfx". Output: "Battle.net\SWF\MainUI.gfx".) (CopyPatchConverter::Repack)

That's why it would be cool if Terran users playing beta could check stats below

edit:

On March 23 2010 01:24 MorroW wrote:
heres some data i fixed from the MPQ and cleaned up

(to repair it must be mechanical, so u cant repair marines :p)

On March 23 2010 02:15 HTX wrote:
Good to know. Did you notice that protoss units are repairable in a 2v2 game? Maybe you can add this too.

On March 23 2010 11:33 caution.slip wrote:
in addition to right clicking the repair icon, SCVs can be set to auto-repair by hitting 'Alt'+'R'.

from the topic:
http://www.teamliquid.net/forum/viewmessage.php?topic_id=114943

I think that those can be stated as facts:

gas is much more valuable resource in SC2,
SCVs mine less minerals but reach saturation faster
there is the MULE to boost mineral income -> more units but everything making them that is not a CC or Barracks costs precious gas
SCVs can be ordered to start to auto-repair anything nearby by right clicking Repair icon

Yesterday I've checked costs of repairing of all units and this is what I've got (most of stats are +/- 1)

minerals and gas cost of the full repair // minerals and gas cost of the new unit
+ Show Spoiler +

MULE

12 to 13

SCV 1/60

12 to 13

// 50

Factory units

Hellion 1/90

25

// 100

Siege Tank 1/150

38

// 150

125

Thor 1/400

75

// 300

200

Starport units

Medivac 1/150

32

// 100

100

Viking 1/125

31

// 125

100

Banshee 1/130

37

// 150

100

Raven 1/140

25

// 100

200

Battlecruiser 1/550

100

// 400

300

In short - every unit is repaired for 25% of it's cost (except Medivac's ~32%)

Now let me quote part of Mikilatov's OP from MULE - Hunting the Wumpus thread

On March 07 2010 10:03 Mikilatov wrote:
PART 1 - MULE VS. SCV

STAGE 1

For this first test, I simply wanted to see what a MULE mines over one lifespan vs. an SCV in the same period of time, with the same mining distances in each case.

The MULE lasts 90 seconds, and it mined 270 minerals.
The SCV mined 90 minerals in 90 seconds.

In one lifespan, it's safe to say a MULE is about 3 times more efficient than an SCV.

Putting travel time aside - if we assume that 1 SCV mines about 1 mineral per 1 second then even though it's not mining while it repairs it's still ~40% cheaper to repair a Hellion than to make a new one!
All units can fire while being repaired (well I haven't checked this but I don't think they don't), it also takes (much) shorter amount of time than making a new one and waiting till it reaches the rest of the forces.

Could keeping few SCVs with the rest of your forces most of the time allow for more aggresive use of all units and make Thor(s) and Starport units more viable to use?

I'd like to add that Salvaging Bunkers always gives 100 minerals, it doesn't matter if and how badly they are damaged.

Repairing Turret seems to take forever though, I didn't check exact time but definitely longer than 25s it takes to make a new one.

Bigpon86

United States238 Posts

March 22 2010 16:13 GMT

Good post. Yes, it is smart to bring along 3-6 scvs to repair when you are mech heavy. Every once in a while I will mech vs a z on some maps and having scvs to repair is a god send.

Pure.Calm

United Kingdom196 Posts

March 22 2010 16:24 GMT

Plus the AI autotargets SCV's so you can use them a bit more tacticly if needed, but in general i dont think bring them to repair seems like a good idea unless you have a massive mech army =P

MorroW

Sweden3522 Posts

March 22 2010 16:24 GMT

heres some data i fixed from the MPQ and cleaned up

(to repair it must be mechanical, so u cant repair marines :p)

i dont think its worth sending scvs along with ur army just to repair like that because they r in the way, scvs auto repair actually doesnt repair the closest target, i dunno how it works but if 3 units r dmged the scvs doesnt pick the closest one, its rly stupid

most of times in a battle many units die and u either win or u lose the game, this is how sc2 works most of the times atm. so healing ur army after a battle is not as important as spending ur money to build abig battle

if u have dmged units i think its better to send them to the mineral line and then repair them instead of sending out the scvs, i dunno tho :p

my guess would simply be (cost/repair time)/2 = repair cost/second but im not sure

On March 23 2010 01:24 Pure.Calm wrote:
Plus the AI autotargets SCV's so you can use them a bit more tacticly if needed, but in general i dont think bring them to repair seems like a good idea unless you have a massive mech army =P

workers has the same priority in sc2, the enemy attacks the scv if its closer else it attacks the rines or w/e

fulmetljaket

482 Posts

March 22 2010 16:25 GMT

yea man bringing some scvs along to repair definitely seems beneficial. ill have to try it sometime. it seems it would be very good in an early air assault. do a little harrass until you take significant damage, retreat back to your repair bots, then do it again. all the while cranking out even more air units, or tanks, or whatever you are teching.

beetlelisk

Poland2276 Posts

March 22 2010 16:45 GMT

On March 23 2010 01:24 MorroW wrote:
heres some data i fixed from the MPQ and cleaned up

(to repair it must be mechanical, so u cant repair marines :p)

i dont think its worth sending scvs along with ur army just to repair like that because they r in the way, scvs auto repair actually doesnt repair the closest target, i dunno how it works but if 3 units r dmged the scvs doesnt pick the closest one, its rly stupid

most of times in a battle many units die and u either win or u lose the game, this is how sc2 works most of the times atm. so healing ur army after a battle is not as important as spending ur money to build abig battle

if u have dmged units i think its better to send them to the mineral line and then repair them instead of sending out the scvs, i dunno tho :p

my guess would simply be (cost/repair time)/2 = repair cost/second but im not sure

Show nested quote +

workers has the same priority in sc2, the enemy attacks the scv if its closer else it attacks the rines or w/e

Thank you, edited in

@ bolded part
I think it relies on timing and number of SCVs brought to repair, also bringing more as your army grows - not too many but enough to repair what's left after battles.
Taking proxy Bunkers into consideration - can it be game changing to send some with your initial force?

HTX

Germany265 Posts

March 22 2010 17:15 GMT

Good to know. Did you notice that protoss units are repairable in a 2v2 game? Maybe you can add this too.

oneplus999

United States23 Posts

March 22 2010 17:16 GMT

has anyone tested repairing units with mules? i've heard they can repair, but haven't tested if they are faster or more efficient. probably not worth doing early game, but if you have a bunch of slow bc's on one side of the map and u want some repairs, it might be handy.

TheHof

United States92 Posts

March 22 2010 18:14 GMT

I really like it for tanks- generally my tanks will take a bit of damage, and it's rare if I'm holding that a tank will survive unscathed. In between when my tanks are firing on targets (like an expo from a cliff in a lot of matchups, for example) having an SCV to sit there and repair or build bunkers / turrets really helps out a lot.

beetlelisk

Poland2276 Posts

March 22 2010 22:29 GMT

#10

I was wrong
MorroW's chart is correct and repairing all units, when doing this by only 1 SCV or MULE, takes about as long as making a new unit, Raven being the only exception from this - repairing it is about ~25% faster than making a new one.

On March 23 2010 02:16 oneplus999 wrote:
has anyone tested repairing units with mules? i've heard they can repair, but haven't tested if they are faster or more efficient. probably not worth doing early game, but if you have a bunch of slow bc's on one side of the map and u want some repairs, it might be handy.

MULEs can repair but they do it as fast as SCVs

I don't know yet if they do it in a more efficient way but 1 MULE couldn't last long enough to fully repair a BC

Karas

United States230 Posts

March 23 2010 00:29 GMT

#11

If you send scvs in the front against enemy with autorepair on, will they autorepair otehr scvs? Combined with medivac healing you might get some decent tanking

Feefee

Canada556 Posts

March 23 2010 00:44 GMT

#12

Oh god, it just dawned on me that that might make the marine/scv rush even more annoying^^; immagine half those scv's on auto-repair..

CharlieMurphy

United States22895 Posts

March 23 2010 00:52 GMT

#13

Mules can repair too, dunno if this was mentioned in the op (although it's much more costly to repair with a mule because he mines like 3 times as good as an scv does)

CharlieMurphy

United States22895 Posts

March 23 2010 00:53 GMT

#14

On March 23 2010 09:44 Feefee wrote:
Oh god, it just dawned on me that that might make the marine/scv rush even more annoying^^; immagine half those scv's on auto-repair..

minus the medivac, i thought this was the basis for the imba TvP rush cheese?

caution.slip

United States775 Posts

March 23 2010 02:33 GMT

#15

in addition to right clicking the repair icon, SCVs can be set to auto-repair by hitting 'Alt'+'R'.

from the topic:
http://www.teamliquid.net/forum/viewmessage.php?topic_id=114943