Premix is the safer winter fuel — but emptying the tank is safest.

Ethanol-free premixed fuel will survive the winter in your chainsaw, while pump gas with stabilizer will likely degrade and risk carburetor damage.

The problem with pump gas is ethanol. It attracts water, which can phase-separate and leave a gummy, corrosive mess in your carburetor. Stabilizer slows down oxidation but doesn’t fix the ethanol issue. You might get away with it if the saw is sealed well and the season is short, but it’s a gamble.

Premix like TruFuel or Aspen has no ethanol and comes with stabilizers already in it. It stays fresh for a couple of years in a sealed can, and it’ll do fine sitting in a fuel tank for a few months. It’s the “set it and forget it” option.

But honestly, the best move is none of the above. Run the chainsaw dry before you put it away. A carburetor with no fuel can’t varnish or corrode, no matter what you used. That takes 30 seconds and costs nothing.

If you’re the type who’ll actually remember to drain the tank, pump gas with stabilizer is fine. If you’re the type who’s asking this question in December, use premix.