Diesel vs Gas Car: Which Is Best for You?

There is so much to think about when planning to buy a new or used car. Before you even think about the model, you need to determine how the car will be powered. While there are various options ranging from electric vehicles, hybrids, and plug-in hybrid electric vehicles (PHEVs), diesel and gasoline vehicles are still very popular.

Most car buyers in the U.S. prefer gasoline-powered vehicles over diesel vehicles. However, as more international vehicle brands continue to produce more diesel cars for the American market, one might wonder if diesel-powered vehicles could be better than gasoline ones. This guide covers the differences between these two types of vehicles to help you decide which is best for you.

What's the difference between a diesel and a gas engine?

Diesel engines and gasoline engines are both internal combustion engines. They use a four-stroke cycle to convert fuel into power. However, they achieve ignition in different ways.

Diesel engines don't use spark plugs. Instead, they rely on high compression to ignite the fuel. The air intake gets compressed intensely, causing high temperatures that ignite the diesel fuel injected into the cylinder. On the other hand, gas engines use spark plugs to ignite a mixture of air and gasoline pre-mixed in the intake chamber.

Discussions on diesel vs. gasoline have been going on for the longest time. While it's easier for car experts, ordinary vehicle buyers may struggle to choose between them. The best way to determine the best type of car for you is to weigh the advantages and disadvantages of each.

Pros of a diesel engine

Due to their reliability and efficiency, diesel engines have gained much traction in the automotive sector in recent years. They offer superior fuel economy, strong torque, longer engine service life, and more overall power. Here are a few benefits of a diesel engine.

Fuel efficiency

There is no doubt that diesel engines reign supreme in terms of fuel economy. Because diesel is more energy-dense than petrol, it produces more energy per gallon. In fact, diesel cars can achieve 25-30% better mileage compared to their gasoline counterparts. This translates to significant savings at the pump, especially for those who drive long distances frequently.

More power

Diesel engines produce more torque and overall power. Torque is the twisting force that gives a vehicle pulling power. This makes them ideal for hauling heavy loads or towing trailers, which is why most trucks are diesel-powered.

Durability

Diesel engines are typically built tougher to handle the higher compression ratios and combustion pressures they experience. This means thicker cylinder walls, stronger engine blocks, and more robust components. It also operates at lower revolutions per minute (RPM) than gasoline engines to achieve the same power output. This translates to less wear and tear on the engine components.

Generally, a diesel engine can reach very high mileage figures with proper care. Some manufacturers boast engines lasting well over a million kilometers.

Less carbon dioxide emission

Carbon dioxide emission and its accompanying effect are serious environmental issues that require urgent scientific attention. Climate change is particularly a problem of too much carbon dioxide in the atmosphere.

Diesel engines are more fuel-efficient than gasoline engines, meaning they produce less carbon dioxide (CO2) per mile driven. This is great for environmentally conscious drivers and their pockets as far as fuel efficiency is concerned.

Less maintenance

Fewer moving parts in a diesel engine, particularly the absence of spark plugs and distributors, mean lower maintenance expenses than gasoline engines. This is because there are fewer components that break or need repair. Furthermore, as mentioned above, a diesel engine is made to be durable. As long as you take care of it as you should, it's possible to cover over 200,000 miles without needing significant repair or replacement.

Greater resale value

While how much you sell the vehicle depends on the brand, age, and condition of the car, diesel vehicles usually hold better resale value than gasoline vehicles. This is mostly because diesel engines maintain their performance over an extended period of time. That means you will get more money for the vehicle if you sell it since potential buyers will see it as a better investment.

Cons of a diesel engine

While a diesel engine has great advantages over a gasoline engine, nothing is perfect. Here are a few downsides of a diesel engine.

Higher upfront cost

Diesel-powered vehicles have a higher sticker price due to their more complex engine design and additional features. For this reason, buyers on a budget will likely avoid them. Although it's possible to recoup the extra cost through fuel efficiency, it'll only work if you keep the car for a long duration (at least five years) and use it for highway driving.

Expensive parts

While diesel cars are more durable, spare parts and repair costs are higher. Once a part needs repair or replacement, be ready to pay more than you would for a gasoline vehicle. The best way to avoid costly repairs and keep your diesel vehicle running well is to keep up with regular maintenance.

They are noisier

Through technology development and better engineering, diesel engines have considerably improved, producing smoother and quieter rides. However, despite these ground-breaking improvements, they are still not as quiet and smooth as their gasoline counterparts.

Emit nitrogen dioxide

While diesel vehicles emit less CO2, they emit higher nitrogen dioxide (NOx), contributing to air pollution and respiratory issues. Excessive inhalation of nitrogen dioxide by humans increases the risk of respiratory infections such as asthma. It might also lead to poor lung function in later life.

Pros of a gasoline engine

Popular for their efficiency and versatility, gas engines have become a pivotal component in the modern automotive industry. These engines have significantly evolved, adopting various technological advancements and environmental needs. Here are a few advantages of a gasoline engine.

Lower upfront cost

Gasoline-powered vehicles are generally more affordable to purchase than diesel cars. They appeal to budget-conscious car buyers.

Wider availability

Gasoline engines are the dominant technology in the car market. This translates to more options across different segments and price ranges. You'll find more options for sedans, SUVs, and even sports cars with gasoline engines.

Quieter running

Even with technological advances to minimize noise in diesel engines, gasoline engines are still quieter. This can be a significant perk for drivers who value a more peaceful ride and less engine noise intrusion into the cabin.

Cheaper maintenance

Because gasoline vehicle parts are widely available, their spare parts are cheaper. Plus, the mechanic will charge less to repair. However, because they may require more regular maintenance than diesel engines, the cost of these parts and repairs will add up in the long run.

Better performance for everyday driving

While diesel cars boast more torque, gasoline engines excel in responsiveness and acceleration, especially at higher RPMs. This is an advantage for everyday driving situations like merging onto highways or navigating city streets.

Cons of a gasoline engine

Most people choose a gasoline engine over a diesel engine due to its unique advantages. However, gas-powered vehicles have their own share of drawbacks. Here are the cons of a gasoline engine.

Lower fuel efficiency

Diesel engines offer superior fuel economy, especially on highways. This translates to more miles per gallon and lower fuel costs for frequent drivers. Gasoline engines are less efficient, especially when hauling heavy loads or encountering stop-and-go traffic.

CO2 emissions

While gas engines have better performance for daily rides, they have higher CO2 emissions than their diesel engine counterparts. For instance, burning 1 liter of gasoline produces about 2.3 kg of CO2. This can be a concern for environmentally conscious drivers and in regions with stricter emission regulations.

Limited durability

Unlike diesel engines, which are built for heavy-duty use, gasoline engines generally have a shorter lifespan. They may require major repairs or rebuilds sooner, typically around 200,000 miles, compared to a diesel engine's potential for exceeding 500,000 miles.

Less power for towing

If you frequently tow heavy loads, a gasoline engine might struggle compared to a diesel engine's superior torque. Diesel vehicles offer more pulling power at lower speeds, making them better suited for hauling trailers, boats, or other heavy equipment.

Diesel vs. gas car: Which is best for you?

The ideal car for you between a diesel-powered and a gas-powered vehicle will depend on your driving habits and priorities. For instance, a diesel car could be best if you frequently tackle long highway miles, haul heavy loads regularly, and prioritize fuel efficiency. However, you must remember that you will pay more upfront, and repairs will be pricier, too. On the other hand, if you primarily drive in the city or prioritize a quieter and more affordable option with a broader selection of vehicles, a gasoline car might be the best fit.

Conclusion

Choosing between a gas-powered and diesel-powered vehicle can be tricky, especially for first-time car buyers. Therefore, to find a car that suits you best, weigh the pros and cons of both engines in relation to your individual needs.

However, keep in mind that there are more factors you'll need to consider. For instance, even if gasoline vehicles have cheaper spare parts, you'll pay more if you buy a sports car. Essentially, the best car for you is the one that best suits your driving lifestyle and budget.