I don't have a keggle, but I loose 80% on my 5 gallon batches. I start with 6.5 gals and end up with 5.25 gals, after an hour. So you loosing 2 gallons, seems realistic.
I lost over 2 gallons yesterday with a 5g batch (started with slighly over 6.75g, ended with 4.75), but it wasn't all evaporation. Shrinkage during cooling, hop absorption (5 1/2 oz whole hops), and wort left in the kettle and chiller all contributed.
-a.
Correction, you lose 20% and retain 80%. If you LOST 80%, you would only have 1.3 gallons left at the end of your boil.
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