What the group is useful for
Group ratings help indicate the likely insurance risk of different vehicles. how easy and expensive it is to repair, parts costs, performance and security can feed into how risky the car is to insure. That makes groups useful when comparing several versions of a car.
What the group cannot tell you
Your age, address, driving history, occupation, mileage, where you normally keep the car kept and many other underwriting factors can overwhelm the difference between two nearby groups. Insurers also are under no obligation to price two vehicles in exactly the same way just because their group ratings are similar.
Use it as a filter, not a price list
A sensible approach is to use insurance groups to eliminate obviously unsuitable versions, then obtain actual quotations for the remaining cars.
