Since there's always water in the air if you're not burning the gas up quickly then you'll have the gunk in the fuel tank, carb float bowl, fuel lines  etc. 

If you're running the engine all the time then the ethanol gets cleared through before it can absorb too much water, but if you let it sit, which most small engines do, then it's a mess. 

All fuel for storage or small engines here, is ethanol free, and treated with PRI-G.

Unless it's for the tractor, then it's treated with PRI-D.
We haven't had a fuel related issue since we started that, about a decade ago.

Another tip was to avoid the evil temptation to start and run the motor for a couple of minutes, just to make sure it starts. Doing that causes condensation in the motor and mixed with bi-product from partial combustion could cause pitting in the cylinder walls. If you are going to start a motor, make sure it reaches operating temperature for 5-10 minutes before shutting it down.

If you already own a gas powered tool fine but as those get replaced do consider changing them out for electric ones. Easier, quieter, cleaner, and in the long run cheaper. 

At this point almost all my small gas engined tools have been replaced. Chainsaw, weed whacker, pruning  saw, leaf blower, hedge trimmer, push mower, wood splitter. All much better than the gas ones I used to have. My riding mower is electric now too. The only small combustion engines  I have left  are in my chipper and portable generator. The chipper will be next and the generator has been converted to propane which solves the gasoline deposits problems. 

Now on to converting the next size up, my daily driver and farm tractor That I plan to accomplish in 2023. 

I look forward to the day when I don't have any gasoline or diesel around the place at all.  That will take a bit longer for the tow vehicle and RV.

 And that leaves my airplane, which I can't see electrifying in my lifetime unfortunately. Aircraft engines are horrible e mantenance headaches and avgas is astronomically expensive but batteries will have to get at least 3 to 4x better in energy density to replace gasoline in aviation. At least avgas doesn't have any ethanol in it, but it does still have plenty of lead.

I certainly understand the sentiment. However, there is a small airport in the south bay (Reid Hillview) that has been in operation for decades as things built up around it. The homes and businesses that came in after the airport was operating have been trying to shut down that airport for many, many years.

Their latest gambit was to measure the levels of lead in the soil around the airport, and they discovered that the lead levels are actually lower in that area than they are around freeways and expressways. Speculation is that despite the lead in aviation fuel, the volume (amount of traffic) may be key contributor. That said, they have phased out 100 low lead at that airport. It will probably happen to most places around the country as time evolves. The issue after that is modifying aircraft engines so they can tolerate fuel without lead.

We use a Honda eu2200 that I converted to propane.We love it!

I CAN carry/lift it, but most of the time I get help from Laura.  We found that a simple 3/4"dowel about 2' long inserted through the handle makes it easy for 2 people to carry it.

travel safe and often

Vann

The problem with adopting UL94 is the octane rating. Lead is in 100LL as an octane booster to prevent knock. Airplane engines run at essentially full power all the time, so it's a much more demanding use case than auto engines. Knock will destroy an aircraft engine in very short order.

 So higher compression engines can't run the lower octane  rated UL94. Because the volume of gasoline used in aviation is so low (unlike Jet A for turbine aircraft) it is unrealistic to expect both fuels to be produced, delivered and stored at these small GA airports. So if you own a certified airplane that isn't approved to operate on UL94 and you can't get 100LL at your airport you're pretty much screwed. 

And while there those higher performance airplanes are less common than your run of the mill Cessna 172s etc, they temd to be used more frequently and are thirstier so use relatively more fuel. They are also owned by corporations or wealthy individuals who have more political clout in how their local airports are managed.