The density of gasoline varies but on average is 6.073 lbs/gal as compared to water being 8.34 lbs/gal. This is why gasoline floats on top of water.
The table below provides an approximate weight of the fuel contained inside some common gas cans.
| US Gallons | Weight (lbs) |
| 1 | 6 |
| 2.5 | 15 |
| 5 | 30 |
| 6 | 36 |
| 10 | 60 |
| 15 | 90 |
| 20 | 120 |
