Know something as well as I do
Definition 1 of 1
Pro Tip 1/3Comparative Knowledge
Indicates your knowledge level is matched by whoever you're speaking to. 
After all our practice, you know the plays as well as I do.
Pro Tip 2/3Equal Experience
Suggests both parties have shared the same experience or learning process. 
You've worked here for five years, you know the rules as well as I do.
Pro Tip 3/3Implicit Trust
Can convey trust in the other person's judgment or expertise in that area. 
I trust your decision; you know our customers as well as I do.