Lexus NX 300h MPG & CO2 emissions

The Lexus NX 300h has limited battery-only range and can be thirstier than diesels on a long run

MPG (comb) MPG (extra high) MPG (medium) CO2
37.1mpg N/a N/a 135g/km

The Lexus NX 300h boasts impressive MPG and CO2 figures thanks to its hybrid drivetrain, but in real-world driving the advantages are less clear-cut – whether you’re comparing with a traditional diesel 4x4 or a newer plug-in hybrid.

Lexus NX 300h MPG

The NX 300h only comes with one engine option: a 2.5-litre four-cylinder petrol that returns up to 37.1mpg. That’s with the standard 18-inch wheels fitted; if you specify optional larger wheels, the figure drops slightly. In real-world driving, we’ve seen closer to 30mpg and we’d expect most drivers to return average mpg in the mid-to-late 30s.

Because it lacks the ability to drive very far on batteries alone, the NX 300h can’t deliver petrol-free commutes like its plug-in hybrid SUV rivals. If you drive a lot around town, the battery assistance should make it more fuel-efficient than traditional SUV rivals.

However, it’s not going to be as miserly as latest diesel SUVs like the Volvo XC60 D4 if you regularly notch up high mileage out of town. Either way, the Lexus has a 58-litre fuel tank, so you’ll be thinking of filling up every 350-400 miles.

CO2 emissions

The Lexus NX 300h has a pretty good official CO2 emission figure of 135g/km, but the Volvo XC60 D4 diesel isn’t far behind at 136g/km. Performance is on a par, too, so unless you drive a lot in town, there’s little extra benefit to be had from the Lexus’ hybrid powertrain.

If you do drive in town, the XC60 D4 has a stop-start function to cut pollution when other cars are idling, but can’t compete with the NX 300h’s electric mode – you’d need the much more expensive XC60 T8 Twin Engine plug-in hybrid version for that.