NEDC to WLTP, and what a quoted range really means

Multiply the NEDC figure by about 0.8. NEDC was measured on a gentler cycle than WLTP, so a car quoting 400 km NEDC is roughly 320 km WLTP, and a 500 km NEDC figure is roughly 400 km WLTP. The ratio varies a little by model, mostly with how aerodynamic the car is, so treat it as a close estimate rather than a conversion table. For what the car actually does on a Pakistani motorway, take off another 20 to 28 percent from the WLTP number.

They are three different test cycles, and they are not comparable. WLTP is the European standard and moderately optimistic, NEDC is the retired European one and considerably more so, and CLTC is the Chinese cycle and the gentlest of the three. The same car can quote three very different numbers depending on which one the manufacturer used.

Roughly 60 to 70 percent of a CLTC figure, 72 to 80 percent of a WLTP one, and about 90 percent of an EPA one, before you hold back a reserve. At motorway speed in summer, plan on the lower end. Every model page on this site shows its own derated figure.

Aerodynamic drag rises with the square of speed, so the energy needed to hold 120 km/h is far more than for 100. Petrol cars suffer the same effect but have a far larger fuel tank to hide it. In summer the air-conditioning and battery cooling add to it.

Not useless. It is consistent, so two CLTC figures can be compared with each other. It is comparing a CLTC figure with a WLTP one that misleads, and that is exactly what a Pakistani showroom floor invites you to do.