In case of a power outage, purchasing a generator can serve as a necessary precaution.

When browsing for the ideal type of generator, there are two types to look at; diesel or gas generator. There are other types of generators;

however, These are the most common and extremely useful in getting the power back up. While diesel and gas generators are arguably the best for average citizens, several differences should analyse before purchasing.

The location the generator place in addition to the power it has, are two factors that should be kept in mind when purchasing a generator. In addition to these two factors, there are several other components to analyse.   



The cost for running a generator is purely based on the power load of your unit. As many generators today have low or half mode options on them, you must factor them into your calculation.

As a baseline, however, a standard 5-kilowatt generator will typically consume roughly 0.75 gallons per hour. On average, gasoline in the United States costs about $2.89 a gallon.

Because this number does not frequently fluctuate, running this type of generator daily could be relatively expensive. (With the numbers I gave, it should cost about $52 a day running on a full load). 

iGen4500 generator

Westinghouse Gas Generator


Diesel generators are less conventional than gasoline generators. however, is the ability for the price to rise and fall.

In the United States, it costs on average $3.17 a gallon. If your unit were a 20-kilowatt, it would burn 3.45 gallons an hour. If you let it run throughout the entire day, it would cost about $122. 

diesel generator

Diesel Generator

Video: Difference between Gasoline and Diesel


Fuel efficiency is a crucial aspect to look at when purchasing a generator. To make matters concise, portable diesel generators are more fuel-efficient than gasoline generators. 

Diesel unit simply use less fuel than their gasoline counterparts. If fuel efficiency is a significant factor in deciding which type of generator is best, diesel would be the best bet. 

In diesel generators. The fuel is compressed, which in turn, ignites the fuel. Air and fuel are separate. In turn, increases the efficiency generators have as opposed to gasoline-powered unit. 

On the contrary, gasoline-powered unit mix fuel and air in a carburettor before compression. This process simply is not as efficient as diesel-powered unit. 

A shortcoming diesel generators have, however, is the cleanliness of the fuel being burnt.

Portable natural gas generators burn cleaner fuel than diesel or regular gasoline generators.

While the EPA has worked to reduce emissions and sulphur compositions in diesel, natural gas is always cleaner for the environment. 

In conclusion, if fuel efficiency and environmental impacts are a significant factor in deciding, go with natural gas or diesel generators. 


Noise and heat are substantial factors to consider when purchasing a generator. Should the noise be too loud, day to day life would become much more rambunctious, and the neighbours would be more apt to filing complaints to you. 

Heat may also be a critical factor in determining what type of generator is best for you.

The reason being, the temperature in which the fuel burns results in the heat of the generator as a whole increasing. (Which goes hand in hand with the amount of maintenance the unit would need). 

Contemporary diesel units are much quieter than their older counterparts that were once banned in large neighbourhoods. 

Diesel units will need to replaced less often than gas units. Often, diesel generators can run 30,000 hours before requiring major maintenance. 

This figure is much better than gasoline generators that typically need it after around 7,000 hours.

Life Expectancy 

While there is not a defined answer as to if diesel generators outlast gasoline generators, it is to be noted that diesel generators are cooled by water and run at around 1800 RPM. This is why it can be argued that the lifespan of a diesel unit is greater than gasoline. 

An accurate conclusion that could be drawn would be that it merely depends on the individual type of generator. The life expectancy can ultimately be boiled down to one main component.

Maintenance is necessary for any type of equipment to keep the machinery in good running condition. To prolong the life of a generator (both gas and petrodiesel,), there are vital steps to comprehend and routinely accomplish. 

Firstly, make it a habit to change the oil in your unit regularly. While it seems fairly obvious, this step is often forgotten, resulting in the life of the generator being shortened. 

In addition to keeping the oil in check, it is also necessary to change the oil and air filters. 

Ensuring a generator is maintained well will automatically raise its lifespan. Besides, allowing for the generator to be regularly exercised will enable for its functionality to last as long as possible. 

Pros and Cons of Owning Diesel Generator:


1. It has much longer life spans compared to others. 

2. It uses less fuel than natural gasoline generators. 

3. Require much less maintenance. 

4. Can be used in just about any location. Several different types also exist such as small diesel generators, diesel standby generators etc. 

5. The fuel is less flammable than natural gasoline fuel. 

6. Popular when the gas supply would be interrupted. 

7. Ideal for locations that aren’t quickly supplied with natural gasoline. 

8. Less maintenance is necessary 


1. Diesel fuel is considered a significant pollutant even with regulations from organisations such as the EPA. 

2. Can be louder than natural gasoline generators. 

3. Higher upfront cost. 

Pros and Cons of Owning Gasoline Generator:


1. Cleaner way to generate power (fuel burns cleaner).

2. More affordable than diesel generators.

3. No odour unless there’s a leak.

4. No need to store Gasoline.

5. Easily accessible unless in a remote location.

6. Less expensive.

7. Less upfront cost.

8. Fuel delivered directly to you via pipelines.


1. Inability to operate the generator in case of a pipeline disruption.

2. More expensive maintenance. 

3. Flammable fuel, should a pipeline break, there will be a fire. 

Video: Diesel Vs Gas Generator, The main Difference

Frequently Asked Question

What is the crucial difference between diesel and gasoline?

The critical difference rely on the fuel type primarily. Diesel vs gas prices may vary substantially in addition to the environmental impact that each type of fuel has on the environment.

 While natural gas is better for the environment, it could be harder to access in remote areas. Diesel, however, consistently uses less fuel than it’s natural gas counterpart. 

Is diesel better than gasoline?

There are several factors to consider when deciding which type of generator better serves your needs.

Natural gas tends to be better for the environment. However, it is more flammable, harder to access in remote areas, and the generator requires more maintenance.

Diesel would be better than gasoline if you are looking for a generator that requires less maintenance, more versatile, and has cheaper maintenance costs.  

Why do diesel engines last longer ?

Diesel engines tend to last longer because engines cool by water, and run at lower RPM rates than natural gasoline generators. 

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