| Properties | Gasoline | Hydrogen |
| Molecular weight | 107 – 114 | 2.02 |
| Density (kg/m3) | 721 – 785 | 0.0838 |
| Flammability limits (% vol. in air) | 1.4 – 7.6 | 4-75 |
| Stoichiometric air/fuel ratio | 14.6 | 34.3 |
| Minimum ignition energy (MJ) | 0.24 | 0.02 |
| Auto-ignition temperature (K) | 533 – 733 | 858 |
| Flame velocity (cm/s) | 41.5 | 237 |
| Low heating value (MJ/kg) | 44 | 120 |
| Quenching gap in NTP air (cm) | 0.2 | 0.064 |
| Diffusivity in air (cm2/s) | 0.08 | 0.63 |
| Research Octane Number (RON) | 92 – 98 | 130 |
