1999 GMC Sierra Statistics from North America
Warning, these statistics are based on a biased sample, so should be treated with caution
| Number of reviews | 25 |
| Would buy another GMC? | 40% |
| Would not buy another GMC? | 44% |
| Average Performance marks | 7.0 |
| Average Reliability marks | 6.2 |
| Average Comfort marks | 7.9 |
| Average Dealer Service marks | 5.8 |
| Average Running Costs (higher is cheaper) | 5.6 |