Using the tag line: "Take the pain out of the pump - check out MPG-friendly Kawi's", the manufacturer has listed "EPA" ratings of 23 of its bikes here:
Kawasaki - Kawasaki.com
It doesn't say whether the rating is the combined calculation, city or highway number though. All it says is: "fuel economy estimates are based on EPA emission measurement TEST PROCEDURES."
Top 5:
70 mpg - KLX™250S
61 mpg - NINJA® 250R
55 mpg - KLR™ 650
53 mpg - Versys™
51 mpg - Ninja® 650R