[Mohoender]

This is very short and probably full of mistakes but they are only ideas after all.

Fuels:
Fuel shortages quickly became a problem and regular fuels have become very rare. They are essentially used by the militaries and, often, their use by civilians has been forbidden by the law. Even military units are in very short supply of it. When they have it, it has been reserved for tanks and the most important military operations. Daily, operations are carried out by vehicles using other types of fuels.
Alcohol (ethanol) is now more commonly used with regular gas engines. However, mass production of alcohol is often a problem and performances are slightly reduced. In addition, corrosion is a major problem and many engines break down.
Another solution has been widely adopted for former gasoline engines and that is the gasogenes. As during WW2, these devices are increasingly fitted on vehicles that, as a result, run on methanol. The transformation is more important (but rather simple) than with the direct use of ethanol and corrosion has proved to be less of a problem. Performances are also reduced and the device is highly vulnerable if fitted on combat vehicles. However, several trucks and light vehicles not seeing direct combat are fitted with one. The main advantage is that you can burn wood or wastes in the gasogene and run your vehicle.
Crude Vegetal Oil is also used extensively in place of Diesel. That proved to be a very good solution on many occasion and performance are often maintained. However, due to the higher viscosity, regular extended maintenance is needed. In addition, this can’t be used during winter as it freezes between -5°C and -15°C. Another point is important: pre-heating device must be fitted for optimal use. Another advantage with this is that it can be produce from regular mechanical or non-mechanical press.
Lubricants:
Not as obvious as the fuel shortage, the lubricant shortage quickly became a problem and engines were breaking down everywhere. Again crude vegetable oil was used to help and proved to be efficient on many occasions. However, it is not that good for an engine because of the high temperature involved. Nevertheless, most engines after the Twilight War use a mix of mineral and vegetable oil.

Fuel Productions:
Oil remains in small production worldwide and it is still around. It became extremely expensive and reserves are often under a strict control by the local authorities.
Ethanol is widely produced but is seldom found in large quantities. Many communities are producing ethanol but in quantities that are barely enough for local movements. The region where it can be found in the largest quantities is the South American continent.
Methanol is also widely used and produced from gasogenes. These are mostly fitted on trucks and larger vehicles as they are somewhat imposing. Several lighter vehicles are using them as well but at the expanse of internal room. The main advantage of this system is that it runs on wood or wastes.
Crude Vegetable Oil is the most largely used as it is the most easily produced. However, it can be used on diesel engines only and freeze easily. As a result, its rare in the USA and vehicle running on it can seldom be used during winter (As temperatures have dropped after the nuclear exchange…).