Unleaded Vs. Diesel for Your Vehicle

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The type of fuel can make a difference in the performance, type of maintenance, long-term value and efficiency of a passenger car or truck. There are plenty of advantages and disadvantages of each. The most logical decision is to rely on scientific data that compares vehicles with the two different fuels.  When shopping for your next car or truck, keep in mind the following facts demonstrated through studies.

Fuel Efficiency

Everyone is concerned about getting the best mileage for their dollar. When compared side by side, assuming that diesel and gas are the same price per gallon, there is no competition. In studies where countless vehicles were driven non-stop for 75 miles, the results were always the same. A diesel engine delivers better fuel mileage than a gasoline-powered vehicle, by a conservative 20 percent.

Engine Combustion

Most consumers know little about car engines but will make the assumption that diesel is less clean and less efficient next to gas. Diesel engines are louder and seem to create dirtier fumes. However, when examining the mechanics that produce engine combustion, they are totally unique in how they achieve performance. Because diesel is a heavier grade of fuel, it is able to consistently feed the engine, unlike gas that is thinner and lighter. The entire combustion system of a diesel engine is more contained than that of gasoline, which loses fuel into the air each time it is cranked.


Having a heavier grade of fuel like diesel can create a build-up of carbon on the air cleaner and engine valves in older models. However, these are minor repairs in diesel engines compared to the tune ups and ignition problems that can occur in gasoline-powered engines. Unlike a diesel motor, a gas engine is designed to keep recapturing the fuel, given its light weight. Parts are prone to wear out more quickly from repeated use.

Resale Value

It may be a perception or a valued comment from a mechanic, but diesel-fueled vehicles bring between 20 to 30 percent higher prices at auto auctions than gasoline-powered cars and trucks. New diesel models are more expensive to purchase, but the overall savings in fuel efficiency and maintenance will recoup this amount in 12 to 18 months. In addition to having an auto that provides better gas mileage and needs less maintenance, with a diesel vehicle, you can also enjoy a significant trade-in price when buying a new car or truck. There is no question that diesel out performs gas in every scientific study that has been conducted. The engine of a diesel is able to retain more fuel to maintain consistent pumping instead of constantly renewing, and the engineered design keeps more fuel in the system and not in the air. However, there are drawbacks to diesel fuel. The engines are loud; the pickup speed is slow, and there are visible fumes. Though its fumes are ugly, diesel fuel actually causes less pollution than what appears to be clean-burning gasoline. Over the course of five or seven years, diesel fuel can significantly save you money when compared to gasoline-powered vehicles. While you search for used cars, notice the difference in price of unleaded versus diesel models. Armed with the facts, you can now make a sensible decision on what is truly important to you in a vehicle.


This article was written by Vito Sanchez, a car expert who loves blogging on the side. He writes this on behalf of Advance Diesel, your number one choice for all your car accessories! Make sure to check out their website and see their great products, such as their Airdog Fuel System!