Oh, I do understand about ink costs!!!
BUT: you do not have to print a full-fledged piece of art just to test margins.
Instead, create a PDF || jpg || whatever containing four Xs – one in each corner of the paper. That will not make you spend too much ink.
Is 8.5 x 11 inch your cheapest/basic/normal paper sheet?
In case you do not know how to produce such a PDF || jpg || whatever, I could make one for you.
Addendum: Canon Knowledge Base - Print Area - TS9120
Have fun!
Claes in Lund, Sweden