Super high mash efficiency?

[Brewcrew02]

Designed a recipe based on a clone and getting 75% efficiency. I use Brewology101 for ball-parking my recipes. Here's the pertinent stuff>>

11.5 lb Pale Ale malt
3 lb Vienna
12oz C60L
10oz Aromatic

At 75% efficiency it calculated an OG of 1.075. Well after all said and done I ended up with 5.5 gallons of wort at 1.096.

1.096!!

Please tell me how?! Is Brewology101's "AleAbacus" that off?!

 

[cheezydemon3]

What temperature?

 

[Phunhog]

Couple of things.....did you measure your grain correctly? Are you measuring your liquid volume correctly? Is your hydrometer calicrated?

 

[Brewcrew02]

Used a refractometer AND let a sample cool and measured with a calibrated hydrometer. 15.75 lbs mashed at 154 with 5.5 gallons sparged with 4.5 gal. Boiled 6.6 gallons to about 5.5. I worked at my LHBS so I go in and weigh and mill my own grains. All correct. There's no way I got above 90% efficiency, but that's what my numbers are telling me.