guys, i need your much valued help.
I've a suzuki swift 2010 model which has done 50,000 kms. It was giving me 450 kms to the tank on average but suddenly the mileage went down to 350 kms in the last tank which kinda alarmed me. It was due for a tune-up so I got the tuning done, got the brake pads changed (also due), put in fully synthetic oil, had the tyres changed (also due), put in a meguin fuel additive to clean out the engine block and then hoped that now the mileage would improve. Unfortunately, it hasn't. It's still pretty low and I can't figure out what could be the cause of this. I also got the A/C's gas topped up and the O2 sensor checked. The following are the most likely causes of poor mileage:
- under inflated tyres
- leak in engine oil
- leak in oil
- spark plugs
- stuck thermostat
- clogged air filter
- jammed brake
- oxygen mix (sensor) not working properly.
- bad fuel
- weight in the trunk
I would really appreciate any help. I have a suspicion it might have to do with the A/C cause the A/C has never worked really well on the car. Last few days it's been hot and the A/C hasn't been cooling the car at all so I think maybe the A/C is putting too much load on the car trying to cool the car? I dunno. HELP!