And that's assuming they are sunny days.
It takes about a day to charge my Leaf on a small solar install.
But yes, it needs to be sunny.
And yet nothing prevents you from driving daily.
I'm 100% off grid on solar in the middle of nowhere. My panels could burn up, get hit by hail, get searched by law enforcement, flooded out, eaten by mice, stolen by miscreants, abducted by aliens or buried in snow. And of course in the event of a volcano they are probably not gonna function well.
So they are of course totally unworkable in events when the power grid is down.
But I like using them and they've been reliable so far...
There are practical issues with it, but it's possible. The question is EROI or Energy Return on Investment. Do you get more energy from it than it took to make it, which unfortunately is not there yet. Shrinking it down to fit into your backyard is an exercise left for the reader.
And are regularly rotating that stockpile, because gasoline has a shelf life measured in months
Somewhat simplified: As long as the feedback loop demands an injector duty cycle that is within predetermined limits, it can compensate for and run reasonably well on gas that burns relatively poorly (for whatever reason it does) by simply sending more fuel into the holes.
Conditions that produce pinging are further sought to be thwarted by using a knock sensor for additional feedback.
A Corolla has a lot of stuff going for it that can help deal with fuel variations and issues in ways that a majority of small engines are completely incapable of.
It tends to resolve to: Climb in, turn key, engine starts easily, and car drives fine -- just like it has done thousands of times before.
I drained the old fuel out and replaced with fresh, and it fired up on the first subsequent half-assed pull of the starter rope.
(Which reminds me: It's been six months again already. Time to see if it still works.)
You have to put in in the tank and run it for a bit to make sure that the carbs don't have untreated fuel inside.
Simpler gas equipment like mowers and generators don't have enough compression to really care about anything but ancient gas, and if you run any vehicle that is multi-fuel capable it can detect and adjust compression based on a fuel's capabilities.
Ive been repairing and fixing junkers of cars, mowers, ATVs, generators, and more for 30 years and not once has bad gas stopped something from running. I only remove it if it was clearly having water raining into the tank. In every other case where I couldn't start something after sitting around for 5+ years, it was from the gas gumming up in the carb or the shitty diaphragm pump, which generally means there is little to no gas left to start with.
I wouldn't even suspect gas of ever being bad unless it was atleast a few years old. If the tank was open it could have evaporated, if the tank was closed it probably ain't great gas but I bet it would still run in anything but a high compression application.
Spark, not compression.
The term was always called spark adjustment, never compression. Compression is the thing you work about when milling the heads or exchanging oscillating components (rods, pistons) due to changing the physical geometry of the combustion chamber.
So yes, adjusting the spark timing does technically adjust how compressed the air/fuel mixture is at the moment of ignition. But the term used to describe it has always been "adjusting spark" or "adjusting spark timing" or "adjusting timing". Nobody ever refers to that as "adjusting compression" because the term compression is used to refer to something else.
In places where long power outages are common (hurricane areas), many gas stations have their own generators (they also have a convenient source of fuel to run them!)
My experience with power outages (after big summer storms, not a hurricane thank goodness) has been that my neighborhood is impacted, but that places nearby have power. They tend to restore commercial first, so the supercharger near me is up and running before my house.