I have a 97 starlet EP91 auto petrol with mileage of 140000 kms. I service it every 5000kms ( oil filter, oil and air filter change). Havent changed the plugs lately though. The car is not doing good on fuel as it should, does about 8 km/l in city.
Can it be because of spark plugs being too old or something else?
Your advices and suggestions deeply appreciated....thanx in advance.