Car adverts and brochures are full of figures — power, torque, acceleration times, efficiency numbers — that can look impressive without actually telling you much unless you know what they mean and how they relate to real-world driving.
Power and torque
Power, usually quoted in brake horsepower (BHP) or kilowatts, is a measure of how quickly an engine can do work, and broadly relates to top speed and how a car performs at higher revs. Torque, measured in newton-metres, is the twisting force the engine produces, and it's a better guide to how responsive a car feels at low speeds — pulling away from junctions or overtaking without needing to change down. A car with modest power but strong torque can feel quicker in everyday driving than the headline power figure suggests.
Acceleration and efficiency figures
The 0-60mph or 0-100km/h time is measured under controlled conditions and gives a useful comparison between cars, but real-world performance depends on load, road surface, and driving style, so treat it as a relative guide rather than a promise. Fuel economy and emissions figures are produced under standardised test cycles, which are more realistic than older tests but still won't exactly match your own mileage — your actual figures will vary with how and where you drive, and how heavily the car is loaded.
Other figures worth knowing
- Kerb weight affects handling, braking distance, and how much a car's performance figures hold up when fully loaded.
- Boot capacity, usually in litres, is more meaningful when compared against everyday items you actually need to carry.
- Towing capacity, where quoted, often has conditions attached around braked versus unbraked trailers — check your handbook for the specifics that apply.
- Insurance group is a strong indicator of running cost and is worth checking before you commit to a car, not after.
None of these figures should be read in isolation. A car that looks unremarkable on paper can still be the better real-world choice, and the best way to know is to combine the spec sheet with a proper test drive on roads similar to the ones you'll actually use day to day.
