If you do not use a car for a week, you should consider a trickle charger for the battery.
It is also called a float charger, and you can get one for about $5 at Harbor Freight.
If you don't have an outlet near the car, you could consider a solar powered one, but I have no experience with that.
Sitting will condense water in the gas tank, so some Heat alcohol will help prevent corrosion in the tank.
Besides oil and filter changes every 10,000 miles, you could do an air filter and fuel filter.
There otherwise is no problem, and I often let an extra car sit for 6 months at a time, without problem.
All gas in the area already has alcohol in it.
You can get alcohol-free gas around here -- it's sold as recreation fuel for watercraft and other toys -- but it's significantly more expensive.
>You can get alcohol-free gas around here -- it's sold as recreation fuel for watercraft and other toys -- but it's significantly more expensive.
Here too. Costs about $1/gallon more (but I don't pay much attention to cost). I use it in all of my small engines - lawn more, snow blower, weed whacker, etc.
I still use fuel stabilizer with it, but I haven't had a carb problem since I switched. I still drain the fuel tanks for long-term storage.
Ethanol (alcohol) absorbs water like a sponge. It will absorb it out of humid air, and turn into jello that will clog any carb. I have personally witnessed it, after a varmint chewed through one of my plastic gas cans. Had a bunch of jello at the bottom - basically slightly more than 10% by volume....
Not really a problem for modern cars, as their fuel systems are basically sealed. I wouldn't put it into a classic automobile without an evaporative emission control system though.
Pure ethanol also has about 25% less energy than gasoline.