Limit your mileage and depending on the wording you 'can' attribute any extra miles to other drivers.
Ask if the mileage you declare is personal or for the policy/car. If the former you can put down 5k miles and your family can do the other 5k or whatever miles. Try a subtle change in your job or other such detail to see if there is any difference, keep it garaged or off road etc. If you drive other cars say so cos when you are driving them you're not driving yours.
