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A 10-20% drop in mileage is meaningful. Track tank-by-tank to confirm. Most causes are cheap fixes.
In our network we see these in roughly this order. Diagnostic comes first — never authorise a repair without a written diagnostic report.
Rough combustion = wasted fuel. Plug + coil change (₹2,500-9,500).
Air-starved engine compensates with more fuel. Filter replacement (₹400-1,200) is the cheapest fix.
Sends bad mixture data to ECU. Replacement: ₹2,500-8,500.
One wheel constantly braking = fuel wasted. Caliper rebuild (₹3,500-8,500) before rotor damage.
5% from new is normal. 10-20% drop = something is degrading. 25%+ = something is broken.
Only if your car is designed for it. Using premium in a regular-fuel car is wasted money. Using regular in a premium-required car causes knock and lower economy.
Yes — by 5-10% in extreme cases. Injector cleaning service (₹2,500-7,500) sometimes restores it without replacement.
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