Missed OG by a mile

[latProd]

Hi guys, gonna make this short and sweet.
Tried to brew this on Sunday: (Biere de Garde recipe)

OG: 1.075
FG: 1.012
IBU: 27 (Noonan)

5 kg pilsnermalt, 3 EBC
1 kg munchenermalt, 25 EBC
300 g crystal malt, 120 EBC
25 g black malt, 1400 EBC
400 g cane sugar
44 g Styrian Goldings, pellets, 5,1 % aa, 60 min.
1 tab Servomyces, 15 min.
1/2 tab Protafloc, 15 min.
White Labs WLP011 European Ale Yeast, 0,75-1 mill. celler/ml/°POG: 1.075
FG: 1.012
IBU: 27 (Noonan)



I broke my hydrometer before I took a reading, and when I finally managed to get a new one (36 hours into fermentation) I measured 1,045. Which is way too low. I used 7,5 gallons of water for the mash, and 2,5 for the sparge.
YEah, i admit that is probably too much water, so I guess that is part of why this happened.
But my question is, how much sugar can the yeast consume in 36 hours? Is it possible that the OG was actually a bit higher than 1,045?

 

[Ski12568]

I've had fermentation almost done in about 4 days.

 

[latProd]

So what you're saying is that the actual OG could easily have been higher than when I measured?

 

[Ski12568]

Yes, it could have. But it could also be the same, if fermentation hasn't started.

 

[latProd]

Yes, it could have. But it could also be the same, if fermentation hasn't started.

Okay, I see your point. Fermentation had definately started when i measured, an inch of foam and lots of activity in the airlock

 

[RM-MN]

Depending on the temperature of the fermentation and the type and quantity of the yeast used, it could have been half done in 36 hours.

 

[latProd]

Depending on the temperature of the fermentation and the type and quantity of the yeast used, it could have been half done in 36 hours.

Okay thanks. So, I gueess it's safe to assume it's higher than 1,045 at least. Which makes me happy I can live with 6% abv, so I hope my FG turns out low.
I added 400 grams of sugar in the boil, would it be ok to add another 200 during fermentation to push the FG down as well? Or will that be total overkill?