Advise from the Qatar’s Civil Defence :

The Civil Defence has given notice that within the next few weeks temperature will go up to as high as 50 degree Celsius.
All employees who drive, whether company vehicles or personally owned vehicles, are advised NOT to fill their gasoline tank to maximum. The high temperatures can overheat your gasoline tank. This message serves only as a reminder and precaution for everyone. Please take care and inform your friends and nearby colleagues.