For rental income - can I include the cost of my vehicle purchased in 2018 even if it is used for more than visiting the rental property? and gas receipts?

Yes, you can claim your vehicle expenses, but you can only claim the portion related to your rental.

If you have TurboTax Live Assist & Review, here is how to talk to a Tax Expert: https://turbotax.community.intuit.ca/community/navigating-turbotax/help/i-m-using-turbotax-live-assist-review-how-do-i-talk-to-a-tax-expert/00/873764