Should you take car insurance linked to distance, driving style?

Pay-as-you-drive policies allow buyers to set a mileage limit for their car and offer them discounts over the normal premium. The lower the limit, the bigger the discount over the normal premium. The insurance is valid only up to the limit chosen by the buyer. One insurance company offers three slabs of 7,500 km, 5,000 km and 2,500 km.