| Source | Uncertainty (%) |
| Methane Sensor | 1 |
| Methane sensor calibration correlation | 0.73 |
| Methane gas bottle | 1 |
| Zero air gas bottle | 0.1 |
| LFE | 0.7 |
| MAF | 4 |
| Differential pressure module | 0.025 |
| Absolute pressure module | 0.06 |
| Thermocouple | 0.4 |
| MAF calibration correlation | 0.09 |
| Gas divider | 0.5 |
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