2008 Pontiac G8 Dimensions, Size & Specs

The Pontiac G8's curb weight ranges between 1762 kg (3885 lbs) and 1812 kg (3996 lbs), depending on the specific trim and options. This relatively heavy weight reflects its full-size sedan construction paired with robust powertrains, contributing to its stable handling and solid road feel. The weight also reflects its safety and comfort features.

The Pontiac G8 offers a luggage capacity of 496 liters (approximately 17.5 cubic feet), which is substantial for a sedan. This volume allows for ample storage of groceries, luggage, and other cargo, making the car practical for daily use and longer trips. The trunk space is well-shaped for easy loading and unloading.

The Pontiac G8 comes equipped with two tire size options: 245/45 R18 and 245/40 R19. The 18-inch tires provide a good balance between ride comfort and handling, while the 19-inch tires offer enhanced grip and a sportier ride, often preferred on higher trims. Wider tires at 245 mm help with traction and stability, enhancing driving confidence.

With a width of 1900 mm (74.8 inches), the Pontiac G8 fits comfortably within the width of a standard single-car garage, which typically ranges from 2430 mm (96 inches) to 2740 mm (108 inches). This provides adequate space on either side for opening doors and maneuvering, making the G8 suitable for most home garages without difficulty.

The 2008-2009 Pontiac G8 does not have a direct predecessor within the Pontiac brand as it was introduced as a new full-size sedan based on the Holden Commodore platform. Consequently, there is no earlier Pontiac G8 generation for direct comparison. However, it replaced the Pontiac Grand Prix as Pontiac’s flagship sedan, offering more modern dimensions, improved interior space, and sportier performance.

The Pontiac G8's 4981 mm (196.1 inches) length and 1900 mm (74.8 inches) width place it firmly in the full-size sedan class, comparable to competitors like the Dodge Charger and Chevrolet Impala from the same period. The G8 is slightly wider than some rivals, offering a more spacious cabin experience and an aggressive stance. Its luggage capacity of 496 liters (17.5 cubic feet) is competitive, though some rivals offer larger trunks.

Thanks to its overall dimensions, the Pontiac G8 comfortably seats five adults with generous headroom and legroom in both front and rear seats. The wide stance and length translate to good shoulder and elbow room, making longer trips comfortable. The interior was designed to balance sportiness with comfort, featuring a driver-focused cockpit and sufficient rear passenger space.

While the Pontiac G8's size and weight make it substantial on the road, it remains practical for daily driving. The car offers V6 and V8 engine options balancing performance and fuel efficiency for a full-size sedan. Maintenance costs align with typical American rear-wheel-drive sedans of its segment, and its robust build quality contributes to reliability, making it suitable for regular commuting and longer journeys.

With a height of 1466 mm (57.7 inches), the Pontiac G8 maintains a relatively low and sporty profile for a full-size sedan. This helps lower the center of gravity, which positively impacts handling and cornering stability. The height does not pose significant challenges when parking in urban environments or garages and complements the car’s aerodynamic design for improved fuel efficiency.