Not sure on specifics but my 13" MBP chews through 15% - 20% in about 6 - 8 hours. I turned off sleep, and use safe sleep instead. What is your i7 giving you?
Generally speaking, it should use about 1% per hour of sleep. Are you sure it's sleeping the whole time?
Mac OS X: Why your Mac might not sleep or stay in sleep mode
Generally speaking, it should use about 1% per hour of sleep. Are you sure it's sleeping the whole time?
Mac OS X: Why your Mac might not sleep or stay in sleep mode