| Model Year | 2018 | 2009 | 2009 | 2009 |
| Model | A8 / S8 | G8 | G8 | G8 |
| Trim | S8 Plus | Base | GT | GXP |
| Body | 4dr Sedan | 4dr Sedan | 4dr Sedan | 4dr Sedan |
| | | | |
| Transmission and Drivetrain | |
| 8-speed manually-shiftable automatic | $1300 | | | |
| 5-speed manually-shiftable automatic | | $1000 | | |
| 6-speed manually-shiftable automatic | | | $1100 | $1100 |
| AWD | $1700 | | | |
| RWD | | $0 | $0 | $0 |
| Accessories | |
| Active noise reduction | $0 | | | |
| Hands-free trunk or liftgate | $100 | | | |
| Power door closers | $300 | | | |
| Power trunk closer | $350 | | | |
| Proximity key | $250 | | | |
| Remote start | | $150 | $150 | $150 |
| Remote window/roof operation | $15 | | | |
| Sunshade, rear, power | $225 | | | |
| Sunshades, second row, power | $225 | | | |
| Tilt/telescoping steering wheel, manual | | $250 | $250 | $250 |
| Tilt/telescoping steering wheel, power | $350 | | | |
| Universal garage door opener | $100 | | | |
| Brakes, Airbags, and Other Safety | |
| Active or whiplash-reducing head restraints, front seats | $0 | | | |
| Around view cameras | $500 | | | |
| Blind spot warning system | $200 | | | |
| Brake- or yaw-sensor-initiated collision preparation system | $0 | | | |
| Collision preparation system, rear | $100 | | | |
| Full-size spare tire | $225 | | | |
| Knee airbag, driver | $75 | | | |
| Knee airbag, passenger | $75 | | | |
| Obstacle detection, front | $150 | | | |
| Obstacle detection, rear | $250 | | | |
| Rear side airbags | $300 | | | |
| Rollover sensor | $50 | | | |
| Temporary spare tire | | $150 | | |
| Wide-view front camera | $150 | | | |
| Wide-view rear camera | $0 | | | |
| Cargo Management | |
| Air-conditioned storage compartment | $50 | | | |
| Rear seat pass-through | | $100 | $100 | $100 |
| Climate Control | |
| Automatic air recirculation | $100 | | | |
| Automatic climate control, front | $200 | | $200 | $200 |
| Dual-zone climate control | $125 | | $125 | $125 |
| Heated windshield washer nozzles | $15 | | | |
| Interior air filter | $0 | | | |
| Rain-sensing wipers | $175 | | | |
| Rear air vents | | $100 | $100 | $100 |
| Rear air vents with automatic controls | $250 | | | |
| Rear dual-zone climate control | $125 | | | |
| Residual heat | $50 | | | |
| Variable intermittent wipers | | $75 | $75 | $75 |
| Drivetrain | |
| Limited-slip rear differential | | | $300 | $300 |
| Engine / Motor | |
| Dual-mode exhaust, switchable | $500 | | | |
| Exterior | |
| Body kit | $0 | | | |
| Hood scoop | | $100 | $100 | $100 |
| Laminated front side windows | $200 | | | |
| Laminated rear side windows | $100 | | | |
| Infotainment | |
| Bluetooth audio streaming | $25 | | | |
| CD changer, in-dash | | | $325 | $325 |
| CD player | $125 | $125 | | |
| DVD-compatible player | $0 | | | |
| Handwriting recognition | $200 | | | |
| HD radio | $50 | | | |
| In-vehicle Internet | $150 | | | |
| Media drive | $15 | | | |
| MP3-compatible player | $50 | | $50 | $50 |
| Navigation system | $600 | | | |
| SD Card slot | $25 | | | |
| Surround sound | $250 | | | |
| Telematics service, such as OnStar | | $200 | $200 | $200 |
| Traffic + travel information | $25 | | | |
| Voice control for nav and audio | $100 | | | |
| Wi-Fi hotspot | $50 | | | |
| Instruments, Lights, and Mirrors | |
| Analog clock | $25 | | | |
| Auto-dimming driver-side mirror | $75 | | | |
| Auto-dimming headlights | $200 | | | |
| Auto-dimming passenger-side mirror | $75 | | | |
| Auto-dimming rearview mirror | $150 | | | |
| Cornering lights | $50 | | | |
| Fog light, rear | $100 | | | |
| Fog lights | | $125 | $125 | $125 |
| Head-up display (HUD) | $350 | | | |
| Headlight washers | $50 | | | |
| Heated mirrors | $25 | | | |
| Interior ambient lighting, configurable | $150 | | | |
| LED headlights | $1000 | | | |
| Mirror tilt-down in reverse | $25 | | | |
| Outside temperature display | $50 | | | |
| Power-folding mirrors | $50 | | | |
| Steering-linked headlights | $150 | | | |
| Turn signals on or near mirrors | $25 | | | |
| Seats and Interior Trim | |
| Carbon fiber trim | $200 | | | |
| Cooled or ventilated front seats | $300 | | | |
| Leather door panel trim | $250 | | | |
| Manual lumbar adjuster, driver seat | | $50 | $50 | $50 |
| Manual lumbar adjuster, passenger seat | | $50 | $50 | $50 |
| Massage, driver seat | $100 | | | |
| Massage, passenger seat | $100 | | | |
| Memory system, driver seat | $200 | | | |
| Memory system, passenger seat | $150 | | | |
| Metal pedals | | | | $75 |
| Power 4-way lumbar adjuster, driver seat | $150 | | | |
| Power 4-way lumbar adjuster, passenger seat | $150 | | | |
| Power headrest height adjuster, driver seat | $50 | | | |
| Power headrest height adjuster, passenger seat | $50 | | | |
| Power recliner, driver seat | $100 | | | |
| Power recliner, passenger seat | $100 | | | |
| Power seat belt height adjusters, front row | $25 | | | |
| Power seatback bolsters, driver seat | $100 | | | |
| Power seatback bolsters, passenger seat | $100 | | | |
| Power thigh bolsters, driver seat | $100 | | | |
| Power thigh bolsters, passenger seat | $100 | | | |
| Power thigh support length adjuster, driver seat | $100 | | | |
| Power thigh support length adjuster, passenger seat | $100 | | | |
| Power upper seatback recliner, driver seat | $100 | | | |
| Power upper seatback recliner, passenger seat | $100 | | | |
| Synthetic suede headliner | $650 | | | |
| Upholstered instrument panel | $300 | | | |
| Suspension, Wheels, and Tires | |
| Active steering | $1000 | | | |
| Adaptive dampers - electrical | $500 | | | |
| Air suspension, auto-leveling and height adjustable | $1000 | | | |
| Alloy wheels | $350 | $350 | | |
| Electronic systems calibration selector | $200 | | | |
| Machined alloy wheels | | | $350 | |
| Polished alloy wheels | | | | $350 |
| Sport suspension (upgrade) | | | | $0 |
| Transmission | |
| Steering-wheel-mounted transmission controls | $100 | | | |
| Total Value of Features | $19,920 | $2,825 | $3,650 | $3,725 |
| Value of Feature Adjustments | $17,095 | $0 | $825 | $900 |
| Value of Feature Adjustments | -15,908 | 0 | -775 | -851 |