I drive a Suzuki Khyber (go mini) on petrol - fuel consumption is 13 km/l without A/C in moderate traffic. A return trip to my university costs ~750 in petrol for 80 km if I go straight from home to the university.
I get around 200-300 profit per ride; remember, if a trip costs 400 to the customer, the driver keeps around 300, and the rest is to be paid to Careem.
It takes around 2-3 trips one way to reach near my university, so a total of 4-6 trips a day (adding 15-20 km to my journey). Since I often drive when peak factor is active, then I usually break even, or maybe have rs 150-200 extra profit.
Edit: this doesn't account for the wear and tear on the vehicle (oil, brakes, tyres, hissa and suspension components, wheel bearings etc, not to mention the occasional biker kissing the side of your car with his bike).