Serif or Sans for copious amounts of body copy?

Interstate has been sold into the client as their new font, however, for consistancy I'd like to recommend the use of Interstate throughout the print applications rather than use a secondary font for body copy. This requires hard evidence to convince the client to move away from a serif typeface (currently Times New Roman)

Your guidance please ...


IMHO, bad idea. There is controversy over using sans for extensive text, but the evidence from actual usage is that people don't like it.

I'd be trying to convince the client to replace Times New Roman with another serif font. If it's economy of space they like with Times, there are alternatives in the same vein.