Is it possible to up the mileage allowance on an Agility agreement once it's started? I know the excess mileage charge is relatively reasonable, but I'm finding difficult to stick with my original intention of splitting my mileage between the C63 and one of the other cars (because I love driving it ) so I'm wondering if they'll let me increase the annual mileage and if so it'll work out cheaper than the excess mileage.
TIA
TIA