Automotive
Body-on-frame passenger cars phased out due to unibody design and fuel standards
Automakers shifted away from traditional body-on-frame sedans in favor of lighter unibody construction and more lenient fuel economy rules for light trucks.
The short version
- The final body-on-frame passenger cars, Ford's Panther-platform sedans, ended production in 2011.
- Automakers shifted sedans to unibody construction, which reduced weight and manufacturing costs while improving fuel economy and interior space.
- Federal Corporate Average Fuel Economy (CAFE) standards imposed stricter fuel efficiency targets on sedans than on light trucks, incentivizing manufacturers to focus on SUVs and pickups.
Key facts
- The last body-on-frame passenger cars produced were Ford's Panther-platform models, which included the Crown Victoria, Mercury Grand Marquis, and Lincoln Town Car, ending production in 2011.[Jalopnik]
- By around 2006, low consumer demand resulted in the vast majority of Ford Crown Victorias being produced specifically for police fleets and taxi services.[Jalopnik]
- Unibody construction provided automakers with a lighter, quieter, and more cost-effective alternative for sedans compared to traditional frame-based designs.[Jalopnik]
- Between the 1990s and early 2000s, CAFE standards set fuel efficiency targets near 30 mpg for passenger cars while maintaining a lower threshold near 20 mpg for light trucks.[Jalopnik]
- Because all sedans were classified as cars under federal rules, inefficient body-on-frame sedans negatively impacted an automaker's overall corporate fleet average.[Jalopnik]