Oklahoma and Kansas aren't covered under EZpass. They are Pike-pass and K-pass, but I think you can get one that is accepted in both those two states.
You’re right. We run K-Tag only and it works in Oklahoma also. I had to get this told to me as I was getting creative in Oklahoma and I was on the phone with a fellow coworker and he told me “you know we have K-Tag set up to cover Oklahoma too right?” Well this is information I could have used yesterday, but I do now.
What about Florida? I rarely go there but when I do I am never sure if what we have works there or not. We have EZ pass and Best Pass. Why we have both I have no idea.
I use Pike Pass, which is good for Oklahoma, Kansas, and SOME of Texas. It's a good investment, with discounted tolls and the convenience of payment and monthly statements online.