First year depreciation can be up to 25%, in some cases more, but average is around 20% of the purchase value on new vehicles. This applies to all vehicles. The more the vehicle costs, the larger the percentage depreciation dollar amount is. A 46K truck at 20% 1st year depreciation is now worth 36,000.00 on average. These numbers have little or nothing to do with the vibration issue some trucks are having here.