This link takes you to a discussion of the experiment Boyle performed, the data he gathered and his picture. His law gives the relationship between pressure and volume if temperature and amount are held constant. If the volume of a container is increased, the pressure decreases. If the volume of a container is decreased, the pressure increases.
You will be paid an annual salary of Â£40,000 gross. . You will receive a car allowance of Â£350 per calendar month for you to use your private car and you will be reimbursed the mileage you do on company business at 40p per mile for the first 10,000 miles per tax year and thereafter at 25p per mile. am presuming car allowance will be fully taxed as salary and mileage paid Gross. Note it is very unclear from your post if this assuption is correct. At face value it looks like your boss is using the most tax efficient system for paying you for the car.
Lowering Efficiency. Flat car allowances encourage employees to drive less for work in order to take home more money. Paying an employee who drives 500 miles a month the same amount as one who drives 1,500 miles a month overpays the low-mileage employee and underpays the high-mileage employee.