Before there is a possible disaster everything from a snow Ice/storm, or X class CME or hurricane you always here that "you should fill up your car with gas". Chances are your car holds at least 10 gallons and if you have a suburban like mine then it holds 40 gallons. What good is that going to do if you cant go anywhere? When you can't go anywhere what can you do with all that gas in your car? Sure you can start your car and idle it to charge some kind of small electronic device or run a power inverter. If you are in a winter storm and your power is out then you could go out start the car and warm up for a while. If you have a power inverter you could power it up with the vehicles electrical system. (Note: cheap modified sine wave power inverters damage small electronics, especially battery charging stuff, cell phones chargers and laptop power supplies. Problems with that I can see is using the heater is very inefficient and a possible carbon monoxide risk. Problems with using the car as a power source especially if you are using a car with a little alternator it may be possible to drain the battery and kill it and now you have a car with a dead battery. A cars alternator can usually put off an extra 30 to 50 amps with no head lights or blower fan going at idle. A newer heavy duty truck alternator can put off 50 to 100 amps at idle with no lights or blower going. How to get gas out of your vehicle? Well forget syphoning, even in a normal situation its a bad idea. Vehicles have a screen or other blockage to prevent syphoning, some cars I have seen have a fuel tank filler line reduces down to a 1 to 3/4 inch inside diameter that runs around like a snake through the back of the car and I see no way to feed a hose all the way down a filler tube like that. Plus the last thing you want to do when you cant get to a hospital is accidently inhale some gasoline or diesel into your lungs or get it in your eyes. For me and my EMP resistant carbureted vehicles it was easy. I converted them to electric fuel pump to get the fuel line away from the engine to prevent vapor lock in hot weather and I added a fuel tap, super easy for me and it can fill a fuel can pretty fast. My Camaro holds around 14 or 16 gallons of gas and my suburban has the large 40 gallon tank. Then there is my wifes car, a modern fuel injected 2008 Hyundai. It has a schrater valve on the fuel rail that is easy to get to. Should be easy enough to tap into, it would be slow to fill a 5 gallon can. With the suburban and Camaro I have fairly minimal interest in tapping into my wifes car fuel supply. Most of the schrater valves I see are -4AN or 1/4'' flare type fittings, some are like a tire valve. Easiest way to get fuel out of a schrater valve would be to bleed off the fuel system pressure, remove the schrater valve core and attach a hose with -4AN female connector. Most important thing is don't lose the valve core or just replace the valve core with a -4AN cap. If you don't have some predetermined way to remove fuel from the vehicle it can be hazardous. For starters new fuel injected vehicles maintain pressure in the lines after they are shut off, so if you disconnect a line or tap into a schrater valve gas is going to spray every where upon the seal breaking. To release pressure you can pull the fuse or relay to the fuel pump and start the car, this is what I have always done before working on fuel injection systems to release pressure. The car will fire up and die and not restart then you know almost all the fuel pressure is gone. It turns a spray of fuel into a little spurt. To remove fuel you could disconnect the fuel filter if you can get to it and use it to fill a can or disconnect a fuel line if you can reach it and fill a gas can, but any O-ring boss fitting you break open may not fully reseal when you put it back together with out a new O-ring. The safest way would be to tap into a schrater valve if you can reach it. The schrater valve is for testing fuel pressure and bleeding air out of the lines at the factory after putting it together so flow may be pretty slow. Then to get fuel out replace the fuse or relay and just turn the key to "on" and fuel will shoot out of the fuel line at a pretty fast rate. Now with this fuel tap I don't have to carry a gas can in my car or suburban, I just fill the gas can or lawn mower from the fuel tap, its always ready to provide fuel even on a daily basis. Bottom line, don't wait till you need it before you start trying to figure it out, kind of ties in with that "have a plan/training" everyone is always talking about on here. Once you have the gasoline out of the vehicle, assuming no disaster occurred, then you know what to do with it Gasoline generators over 5kw are very inefficient at light load, at no load or light load they can suck down gasoline at a rate of a half gallon of gas per hour. Using a car as a power source would be more efficient for the little things. The car and the generator announce to everyone that you have fuel/power. A move covert way to utilize the power contained within your gasoline is with camping gear. I have my old coleman "white gas" AKA gasoline stove and lantern. Now these have not been used in at least 14 years so I am going to assume the plunger pumps are bad and get some $12 replacements. When I get home I am going to fire them up. The stove puts off up to 12,000BTU per hour, it would burn through a full fuel tank in under 2 hours. The single mantel lantern makes about 100w of light and puts off about 1,000 to 1,200BTUs per hour of heat on the high setting. If I remember correctly it only held 12 to 16 ounces of fuel and ran all night on high no problem. Always light these things out side and inspect the gas generator tube of scorching and wear. After several years of once or twice a month use I found the gas generator nozzle a little loose on my relatively new made in 1993 lantern. In the late 1970s my dad had a 1930s era lantern burst into flames during operation inside his off grid cabin, he was able to toss it out side before it could set the cabin on fire. They can be dangerous, inspect the gas generator tube regularly and replace when questionable, its a $5 to $10 part. These have extreme carbon monoxide poisoning danger indoors, do not use in a tent or camper or under ground bunker. If you have a normal size house with normal drafts there is virtually no carbon monoxide danger with a single stove or lantern.