My rates are as follows; breakfast $12, lunch $15 and dinner is $29 for local per diems, the far trips are $15,$17,$38 (out of province). I also get incidentals at $12/night to cover hotel movies, tips, dry-cleaning etc. As a side bonus I also charge my meals to my credit card, it's around $2000/year in spending. That's optimization for you.
I prefer per diems; on average I save quite a bit and eat healthier. I'd find out the rates being offered and compare it to the last 6 months of your meal expenses. I'm guessing its tracked on your company card. I have the option of charging it all to my card if I wanted to, its the opposite choice from you.