1999 GMC Sierra Statistics
Warning, these statistics are based on a biased sample, so should be treated with caution
| Number of reviews | 23 |
| Would buy another GMC? | 43% |
| Would not buy another GMC? | 48% |
| Average Performance marks | 6.7 |
| Average Reliability marks | 6.1 |
| Average Comfort marks | 7.6 |
| Average Dealer Service marks | 5.7 |
| Average Running Costs (higher is cheaper) | 5.4 |