I am a 1099 who does in home sales. I rented a car for 6 mo from a family friend and paid them for use but also paid gas, maintenance, etc. How do I deduct correctly?

Right now I've deducted itemized costs under the vehicle section for a car neither myself or a spouse owns (gas, maintenance, oil changes, cleaning etc) and also deducted the vehicle rental costs in the equipment rental deductions reflecting what I paid for the rental. Am I doing this right? Since the car was split about 80% business use 20% use I am aware I will have to apply 80% to these amounts for a correct deduction.

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