The published IP rate is actually a poor measure when it comes to calculating decline rates. If you look at some of the wells on the latest presentation, you'll see (as an example) a well with an IP rate of 3035 and a 90 day rate of 1090 - thats a 67% decline in 3 months!.
A better measure is to use the average production over the first 30 days ( which KOG doesn't publish.)