Why fuel economy drops over time
A new car sips fuel the way the manufacturer promised. Three years later, the same car doing the same commute somehow burns more per tank. It's not in your head — it's wear. Clogged air filters restrict breathing, tired spark plugs misfire, gummy injectors spray unevenly, and dragging brake pads add resistance you can't feel but your fuel gauge can.
The good news: most of these are reversible with basic maintenance. You don't need to buy a new car to get close to day-one economy.
Check your tyre pressure — the easiest win
Underinflated tyres are one of the biggest fuel wasters we see, and also the cheapest to fix. Every 0.5 PSI below spec increases rolling resistance and costs you fuel. In Singapore's heat, tyres lose air faster than you'd think — check at least once a month, cold, before you drive.
While you're at it, misaligned wheels make the car fight itself. If your steering pulls or your tyres wear unevenly, alignment correction pays for itself in fuel savings within weeks. We check alignment as part of servicing if the wear pattern suggests it.
Air filters, spark plugs, and engine breathing
Your engine needs clean air to burn fuel efficiently — a dirty air filter is like trying to run with a cloth over your mouth. Replacement is cheap and takes minutes, but plenty of drivers go 40,000 km without changing it.
Spark plugs are the other side of the equation. Worn plugs misfire, waste fuel, and can trigger warning lights. Continental cars like BMWs and Mercedes often use iridium or platinum plugs rated for longer intervals, but they still wear out. We've seen cars gain noticeably better fuel economy just from a plug and filter change.
Oil grade matters more than you think
Not all engine oil is equal. Using the wrong viscosity — too thick, too thin, or the wrong spec entirely — forces the engine to work harder. Your manufacturer specifies a grade for a reason: it's the sweet spot between protection and efficiency.
At JW Motoring, we always use the oil grade your car was designed for. It's a small detail, but over 10,000 km it adds up. If you're not sure what your car needs, that's exactly the kind of thing we'll walk you through during servicing.
Brakes that drag cost you fuel (not just pads)
Sticky calipers, seized slider pins, or a partially engaged handbrake can cause constant low-level friction. You might not feel it from the driver's seat, but your fuel consumption tells the story. We've diagnosed cars burning 10–15% more fuel just because a rear caliper wasn't releasing properly.
If your car feels like it's 'holding back' or one wheel is hotter than the others after a drive, that's worth checking. It's not just about saving fuel — dragging brakes generate excessive heat and wear out pads and rotors prematurely.
Driving habits that cost you $20 a week
Aggressive acceleration and late braking are the two biggest fuel-burning habits. In Singapore's stop-start traffic, smooth throttle application and anticipating stops makes a measurable difference.
Idling is another quiet drain. If you're stopped for more than a minute (picking up the kids, waiting for a gate), switching off saves more than you'd expect. Modern cars with start-stop systems do this automatically, but many drivers disable it — worth leaving on if fuel economy matters to you.
When 'premium fuel' is actually worth it
If your car's engine is designed for RON 95, putting RON 98 in won't give you better performance or economy — you're just paying more. The exception is high-compression or turbocharged engines that specifically require higher octane. Check your fuel cap or owner's manual.
There's no harm in using a higher grade, but there's no benefit either if the engine doesn't need it. Spend that money on proper servicing instead — it'll do more for your car's health and your wallet.
What we check at JW Motoring to help your fuel economy
When a car comes in for servicing, we look at air filters, spark plugs, injector condition, tyre wear and pressure, brake drag, and fluid grades. These are the things that quietly erode fuel economy over time, and most of them are straightforward to fix.
If you've noticed your car drinking more than it used to, bring it in. Sometimes the cause is obvious — sometimes it takes a proper look. Either way, we'll give you a straight answer and only recommend what actually helps. Drop us a WhatsApp at 8225 5220 or fill in the form on our contact page.