For instance, their refrigerator may only need 700W to run, but it takes an additional 2,800W to get it started. Fuel for thought Emergency power standby generators generally run on gasoline, diesel fuel, natural gas, or liquid propane. Gasoline, propane, and natural gas generators are less expensive, but many manufacturers and dealers boast diesel fuel as the most cost-effective form of generating power in the long run. Diesel units cost a little more up front, but Francis Ford, president of Fords MTM, a dealer in Salmon, ID, says they provide power at a much lower cost per hour over the lifetime of the unit. They have fewer moving parts, leaving less room for problems.
Diesel engines tend to outlast gasoline in the long run.
The engine life of a gas generator is measured in hundreds of hours, while diesel is in the thousands. Diesel is also a lot less expensive to run, because of the low consumption rate. But even though diesel may be a little safer, it does have its problems. The fuel gels in some colder climates, but that can be remedied by adding quality fuel additives. It's also a good idea to check out local and state ordinances about diesel fuel.