In order to claim vehicle expenses, you must have the mileage figures (total km driven in the year and total km driven for business) for each vehicle as well as receipts for the actual expenses such as gas, repairs, etc.
The downpayment for the new vehicle is not a deduction but you can take a Capital Cost Allowance deduction (depreciation) for the vehicle itself. And for the leased vehicle as well.
You can also deduct the lease payments and fees for the first vehicle.
Visit turbotax.ca/uber for more information on claiming expenses as an Uber partner. You'll also receive a discount on the TurboTax family of self-employment versions including TurboTax Assist and Review for Self-Employed.