BAD GAS is the number one reason we find for small engines failing to start.
Often, just draining the gas from the tank, draining the gas from the carburetor, then filling with good fresh gas is all it takes to make it start and run good again.
Even a small amount of old leftover gas in the bottom of your gas can will hurt. New fresh gas in your can that has just a little water condensation in the may cause your small engine to fail to start when you think you just put in fresh gas.
We are more than happy to properly drain the gas from your mower or chainsaw or snowblower or other small engine. We will also drain your gas can and properly dispose of the old stale gas in it. Then we will clean and fill with good fresh gas.
Ethanol in your gas is not the problem. The small engines are made to run on the blended ethanol gasoline from the pump, same as in your car. You can run on regular gasoline, no need and no real benefit in running premium gasoline. The real problem is your mower gas tank and your gas can is vented. The vented tank or can will "breath in" every night as the air cools, and "breath out" every day as it warms up. This breath-in and breath-out from the humidity in the air will attract moisture to the ethanol in your gas. The moisture quickly builds up and causes the gas to go bad or stale. Over longer time (storage) it can gain enough moisture to plug or corrode the extremely tiny passages inside the small engine carburetor, which becomes a big problem.
Run your machine dry of gas to avoid the issue. Pour the leftover FRESH gas from your can into your car to use it up. The small amount of gas in your can will be quickly diluted by the big tank of gas in your car. Just don't put old stale gas from your can into your car.
Non-Oxygenated regular gas is available at some gas stations, and will stay fresh longer.