Due to illness, have not used boat for two years. Have two gas tank filled with gas , did use stabilizer. Could I still use the gas?
NO I would not, dispose of it properly and clean out the tank bottoms and start over with fresh fuel and if you can get it use high test as it does not have Ethenol in it, also clean out the carbs if you boat has them, will save yourself alot of greif.
I once had an (old) car where all the gas had evaporated, all that was left was brown goo in the bottom of the tank. It took a lot of cleaning to get rid of it...
Fresh fuel sounds good!