Fill out a comment card, if you think their menu does not have enough selection. If the company receives enough of these, they may decide to follow up on them. Taco-Bell do not use lard anymore in their cooking. Yes, rumours abound about maple syrup containing pork fat. The US vegan society has checked all known sources and found that they are all suitable for vegans.
Some refined sugars use bone charcoal as a decolourant.
In the UK Tate and Lyle and Billingtons sugars are free of animal substances. No data is presently available concerning sugar in other countries.