Smooth driving, correct tyre pressures, and shopping your insurance every single year. Those three are worth more than every fuel-saving gadget ever sold.
The controllable costs of running a car are fuel, tyres, insurance and maintenance timing. Depreciation is larger than all of them, and it is decided when you buy rather than while you own.
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Anticipate and coast rather than accelerating and braking, keep the tyres at the right pressure, take the roof bars off, and slow down on the motorway.
For most ordinary cars, no. It is worth it only where the manufacturer specifies a higher octane, which is generally performance and some turbocharged engines.
Shop around three to four weeks before renewal, pay annually rather than monthly, and check whether a slightly higher voluntary excess or a black box policy helps.
The legal minimum is 1.6mm across the central three quarters, but wet braking deteriorates badly below about 3mm. Age matters too: rubber hardens after about six years.
Add depreciation, insurance, tax, fuel, servicing, tyres and MOT, then divide by the miles you actually do. Depreciation is usually the biggest line and the one nobody counts.
Tipking is general household information, not professional advice. Test anything on a hidden patch first. Full disclaimer.