To convert 1.5 liters to gallons, use the conversion factor:
1 liter=0.264172 gallons
Now multiply:
1.5×0.264172=0.3963
1.5 liters ≈ 0.40 gallons (US).
If you’re converting to UK (Imperial) gallons, use:
1 liter=0.219969 UK gallons
1.5×0.219969=0.32995
1.5 liters ≈ 0.33 UK gallons.