When I surveyed all the gas docks a year or so ago to be sure I had all the information correct for the WinniGas database, I asked everyone about octane, additives, etc.
I made any notes to each station's notes on
https://winnigas.com/liststations
Basically, additives are noted as this tends to vary widely (some use StarTron and others use ValveTect, but one station lists both!) and most supply 89 Octane, but I list any differences for those that prefer higher octane.
Of course, if a gas dock makes any changes from the time of my survey and doesn't report it to me, I can't update the database. This is why I ask people (customers or gas dock owner/operators) to let me know of any changes.
Thanks to everyone that has reported prices into
www.WinniGas.com as it helps a lot of boaters on the lake. I've tried to make it as easy as possible to report prices.
Back to the gas tax refund, I also have the some information on this subject here including the required forms:
https://winnigas.com/about#NHDOT