Over half of new car buyers are missing out on the best deals because they are not fully committed to haggling, according to a survey by Sainsbury’s bank. Only 44 per cent of the 2000 buyers questioned admitted to haggling with any vigour. That equates to 286,000 paying an estimated £382 million too much for their new car over the next six months. Autocar’s sister magazine What Car? has revealed average savings should be £1337.