>>508312540Holy hell anon, that seems a bit excessive.
Even with stabilizers it's only going last maybe about 2... maybe 3 years.
Even if you can use it for that long, you don't really want to use gas that's old and degraded because it can gum up the engine and clog the fuel filter.
If he were to try and use it all within a year he'd need to be using about 3 gallons every day, either that or sell it for a profit.