I am down to half of the tank after driving for 180 kilometers.
From the internet, the car is supposed to have a 44-liter capacity but 9 liters are the reserve. So doing the math, the car is consuming around 9 litres/100km which seems excessive for a 1.5 litre engine. I drive in a low-density town where the speed limit is 60 KM/hr, and there is rarely any form of start-stop traffic. It is hilly, sort of, you meet a couple of non-steep climbs here and there, but I doubt they are the reason behind all of this.
It is a Mazda 2 (2013) with an automatic transmission and a 1.5-litre engine. It had a previous accident history; therefore, it was cheap, and the mechanic I bought it from told me it was just body damage. None of the mechanical parts (engine bay) were affected and restored to an almost new condition. Which is in line with its history as it lists the accident as a rear collision.
The ball bearings on one of the rear wheels sound like they need replacement, but otherwise, I had no issues with the car. The engine sound, torque, and even AC work really well. The engine air filter looks almost like new. Should I be concerned?
What’s the mileage on the car? Have you ever replaced spark plugs? That can make a significant difference to fuel economy. Do you need a new air intake filter or a cleaning of the intake and throttle body? Are your tires properly inflated? Are you carrying around any extra weight? Are you sure your brake calipers are working properly and not sticking? Is your parking brake fully releasing? Is your idle smooth? Have you tried pulling any codes to check engine internals are solid?
Also, if by “ball bearings,” you mean the wheel bearing is going on your passenger side rear, get that fixed. It’s a major safety hazard if it’s going. Could possibly add some drag and hurt your fuel mileage too. Do not delay on fixing a bad wheel bearing.