gas is too expensive. here in florida i guess everyone has a noisy gas powered generator for when hurricanes knock out our power
If its disel, of course. a disel generator with biodisel is an excellent way to recharge batteries in an electric vehicle.
yes bio-fuels are capable of running generators, just in order to make it usable it needs to be subjected to a process of trans-esterification, this will make it like diesel and then can be used easily in the generator. it too depends from which plant u have derived the oil. oil from some plants can be directly used in generator.
I would suggest using a set of solar panels that will supply enough power to run the fridge and a bit more, with a battery storage to get through the night. This can get you through months of power outage. It will be much more costly than a gas generator to provide the same emergency coverage. But you do not use it just for emergency. It provides that power year round for 20+ years, cutting your electric bills. This is not a lot cheaper than just paying your electric bills. If you get the best, most cost effective solar panel system it will be a break even compared to the electric company.
Yes -- if it has a Diesel engine. But most small generators for home use require gasoline. If you are considering a device for emergency use, the fuel cost doesn't matter much; a gasoline unit will do fine.