Having a diesel generator for emergencies is a great idea. There is a great selection at www.dieselserviceandsupply.com .
When considering a diesel generator for use in any establishment, remember that they are not as cost efficient as some other options. The most cost efficient option is a natural gas generator. The biggest advantage to using a diesel generator is that they provide a constant stream of energy.
After doing some research on generator fuel. It seems generators which accept diesel tend to be pricier however they are most efficient and conservative than the other generators on the market. However gasoline also has its advantages as may not be as efficient as diesel but you can use excess amounts to fuel your vehicle. But the same can be said for diesel if you vehicle accepts it.
It's hard to say which electric generator is "most" fuel efficient. It depends on the type of fuel it uses, for one thing, and most popular generators are powered by natural gas or diesel. If cost is your biggest concern, look for a generator that uses a cheaper source of power. When comparing how much fuel each generator uses, also consider the wattage, or else you may be comparing apples to oranges.
Whats the fastest and most efficient
diesel will be powerful
Cheat
As with most items made in China, one of the premier advantages of buying a Chinese diesel generator is that it will be cheaper. The 12kw generator is actually the most popular choice at the moment. Also, Chinese generators are said to be more reliable because they are "over designed" (www.backuppowersystems.com).
Diesel engine
The amount of energy a diesel generator set can produce depends on its size and capacity. Typically, diesel generator sets range from small, portable units generating a few kilowatts (kW) to large industrial generator sets producing several megawatts (MW) of electrical power. A small diesel generator set may produce between 5-20 kW, while larger industrial models can generate anywhere from 500 kW to several MW.
Electrics, followed by diesel, followed by steam.
gasoline or diesel fuel
mostly skoda for diesel engined cars.