The 1968 Charger's Emissions and Fuel Performance
The 1968 Dodge Charger produced between 375 and 425 horsepower depending on the engine option, but it had no emissions controls by modern standards. Cars built that year had no catalytic converter, no oxygen sensors, and no computer management of the fuel mixture. The engine burned leaded gasoline and released all its exhaust directly into the air. Fuel economy ranged from about 10 to 13 miles per gallon depending on driving conditions and which V8 engine you had.
If you own a 1968 Charger or are thinking about buying one, understanding what that means for emissions compliance and operating costs matters for registration, insurance, and how much you'll spend on fuel. The car was built before the Clean Air Act of 1970 set the first federal emissions standards, so it predates every regulation that governs new cars today.
Key Takeaways
- The 1968 Charger produced no emissions controls and burned leaded gasoline, releasing unfiltered exhaust directly into the atmosphere.
- Fuel economy was 10 to 13 miles per gallon, meaning a full tank lasted roughly 150 to 200 miles depending on driving style.
- Most states exempt vehicles older than 25 to 30 years from emissions testing, but rules vary by location and some states test all vehicles regardless of age.
- Restoring a 1968 Charger to run on unleaded fuel is possible but requires carburetor changes and valve seat work, adding significant cost to any restoration project.
How the 1968 Charger Compares to Modern Emissions Standards
A 1968 Charger produces roughly 15 to 20 times more nitrogen oxides and particulate matter than a 2024 vehicle. Modern cars use catalytic converters to break down harmful gases, oxygen sensors to adjust fuel mixture thousands of times per second, and computer systems that prevent raw fuel from entering the exhaust. The 1968 Charger had none of that. Every gallon of fuel burned released carbon monoxide, unburned hydrocarbons, and lead directly into the air.
The difference matters most if you live in a state that tests emissions on older vehicles. California, for example, tests all vehicles regardless of age. Most other states exempt vehicles built before 1995 or 1996, though the cutoff year varies. Check your state's Department of Motor Vehicles website to find the exact rule where you live, because registration and inspection requirements depend on it.
Fuel Economy and Operating Costs
The 1968 Charger's fuel economy reflects its era. The base 318 cubic-inch V8 achieved roughly 10 to 11 miles per gallon in mixed driving. The 440 Magnum and 426 Hemi engines, which produced the most power, returned 9 to 10 miles per gallon. These numbers assume normal highway and city driving; aggressive acceleration or sustained high-speed driving reduced them further.
At current gas prices, that translates to roughly $0.25 to $0.30 per mile in fuel costs alone. A 300-mile road trip would cost $75 to $90 in fuel. If you drive the car regularly, budget for frequent fill-ups and plan routes around gas stations. Leaded fuel is no longer sold at pumps in the United States, so running a 1968 Charger on the road requires either using unleaded fuel with an additive package or converting the engine to run on unleaded fuel.
Leaded Fuel, Unleaded Conversion, and Engine Wear
Leaded gasoline, which was standard in 1968, contained lead compounds that protected the engine's valve seats from wear. When the EPA phased out leaded fuel in the 1980s and 1990s, owners of older cars faced a choice: add lead substitute to unleaded fuel, or modify the engine to run safely on unleaded fuel without it.
Using unleaded fuel with a lead substitute additive is the simpler and cheaper option. Products like Techron or Marvel Mystery Oil can be added to each tank and provide some protection, though they do not fully replicate what leaded fuel did. The engine will wear faster over time, particularly the valve seats, but many owners run 1968 Chargers this way without major problems if they drive the car occasionally rather than daily.
A full conversion to unleaded fuel requires machine work: the cylinder head must be removed, the valve seats must be replaced with hardened seats designed for unleaded fuel, and the carburetor may need adjustment. This work costs $1,500 to $3,000 depending on the machine shop and the engine size. It is permanent and makes the car safer to drive long-term, but it is a significant investment for a restoration project.
Registration and Insurance for Older Vehicles
Most states allow you to register a 1968 Charger as a classic or antique vehicle, which often comes with lower registration fees and reduced insurance costs. The exact rules vary by state. Some states require the car to be at least 25 years old; others use 30 years as the cutoff. A few states have no age requirement but instead base it on the vehicle's condition or whether it is used for daily transportation.
Classic car insurance is usually cheaper than standard coverage because insurers assume the car is driven less frequently and kept in better condition. You will typically need to prove that the car is garaged, that you have other vehicles for daily use, and that you will not drive it more than a certain number of miles per year—often 2,500 to 5,000 miles. Read the policy carefully, because some classic car policies do not cover commuting or regular use.
What Happens During Emissions Testing in States That Require It
If you live in a state that tests all vehicles regardless of age, your 1968 Charger will likely fail a standard emissions test. The test measures tailpipe emissions of nitrogen oxides, carbon monoxide, and hydrocarbons. A 1968 Charger, with no emissions controls, will exceed the limits set for even the oldest vehicles in the testing program.
Some states offer a waiver or exemption for vehicles that are older than a certain age and cannot be brought into compliance without major modification. California does not offer this waiver; vehicles must pass or be registered as non-operational. Other states may allow registration if the vehicle is certified as a collector's item or if you agree to drive it only on weekends or for shows. Contact your state's emissions testing program directly to learn what options exist where you live.
Storage and Seasonal Use Considerations
A 1968 Charger stored for months at a time requires special care. Fuel left in the tank and carburetor will separate and gum up, making the engine hard to start when you bring the car out of storage. Before storing the car for more than a month, either drain the fuel tank completely or add a fuel stabilizer like Sta-Bil to the tank and run the engine for several minutes to circulate it through the carburetor.
The battery will discharge slowly even when the car is not running. Disconnect the negative terminal before storage, or use a battery tender that keeps the charge topped up. Tires will develop flat spots if the car sits for months without being driven. If you plan to store the car for a season, inflate the tires to the maximum pressure listed on the sidewall, or move the car every few weeks to prevent permanent damage.
Frequently Asked Questions
Can I drive a 1968 Charger on public roads if it fails emissions testing?
It depends on your state. Most states that exempt older vehicles from testing allow you to register and drive them. States that test all vehicles may require a waiver, a non-operational registration, or proof that the vehicle is a collector's item. Check your state's Department of Motor Vehicles or emissions testing program for the specific rule.
What is the difference between a 440 Magnum and a 426 Hemi in a 1968 Charger?
The 440 Magnum produced 375 horsepower and was the standard high-performance engine. The 426 Hemi produced 425 horsepower and had a different cylinder head design with hemispherical combustion chambers, which allowed for better airflow and more power. The Hemi was more expensive and rarer. Both engines had similar fuel economy of 9 to 10 miles per gallon.
Is it worth converting a 1968 Charger to run on unleaded fuel?
If you plan to drive the car regularly, yes. The conversion costs $1,500 to $3,000 but protects the engine from accelerated wear and makes the car safer to operate. If you drive the car only occasionally, using unleaded fuel with a lead substitute additive is a cheaper short-term option, though it does not provide the same long-term protection.
How much does it cost to insure a 1968 Charger?
Classic car insurance typically costs $400 to $800 per year, depending on the car's value, your driving record, and the insurer. Standard auto insurance for the same car would cost more. Most classic car policies require the car to be garaged and driven fewer than 5,000 miles per year.
What should I do before storing a 1968 Charger for the winter?
Add fuel stabilizer to the tank and run the engine to circulate it, disconnect the negative battery terminal, inflate tires to maximum pressure, and cover the car to protect it from dust and moisture. If you store it for more than three months, move it every few weeks to prevent flat spots on the tires.