The owner or operator of the aircraft will have the POH, and as it forms part of the CofA he is obliged to make it available to you.
There is no copyright on it (for various legal reasons), so you should be able to make a photocopy.
Remember that it is this document and not your checklist which dictates how you should operate the aircraft, so give it a good read.
p.s. I fly an aircraft with the same engine and get 22l/h properly leaned at 2400 RPM, but as its a much better plane than the 152 it will be 3 or 4 up at 110 knots.