The owner has no license... could have had a friend drive him to do some shopping. Or the owner lent the car to a friend since he couldn't drive it. More likely than a stolen car.
As for the smell of gasoline well one thing that pressure cookers are really good at are keeping a seal. So even if it was an improvised bomb and there was gasoline in it chances are that you wouldn't smell it. Pressure cookers and chilli go together like ham and cheese. The most obvious thing was that the driver was taking something cooked to a gathering.
For some reason the police like to blow up anything out of the ordinary. Vary rarely is it anything harmful.