It sounds like you have an interesting project. However, US boaters are mostly using propane stoves and don't like the idea of other fuels and by their use of propane you can infer what you wish about safety concerns. Internationally, diesel, propane, kerosene, alcohol all are available fuels. Alcohol is NOT your primary competition (that appears to be an assumption you're making).
Question for you--
Who is sponsoring your survey/project? Is this a company sponsored project or yours alone? Did you come up with the idea? Or, a professor who is looking for alternative applications of a new technology/patent? It is always interesting to know who is wanting "surveys" to be performed.
I would be very interested in understanding the cost of operating a stove such as you're investigating. Cheaper fuel is always of interest
Best to you,