Why Is Your Car Using More Fuel?
A sudden rise in fuel use has several causes, most of them simple and cheap. Tracking consumption by odometer catches the problem early.
Mechanical causes
Low tire pressure, a clogged air filter, worn spark plugs or a misfire, a weak oxygen or air sensor, or a dragging brake (stuck caliper). Each raises consumption noticeably.
Driving-related causes
Hard acceleration and braking, running the AC at full all the time, extra load, and long idling to warm up. Driving style alone can change consumption a lot.
How to diagnose and save
Start with the cheapest: set tire pressure, change the air filter and plugs on time, and read trouble codes. Mowtar AI computes your real economy (km per liter) and alerts you on any abnormal jump.
FAQ
Consumption rose suddenly with no clear cause?
Check tire pressure and the oxygen sensor first, and look for a check engine light — the cause is usually there.
Does fuel grade matter?
Use the octane recommended in your manual; higher for no reason does not save, and lower than required can cause knock and higher use.