Lexus RX 450h MPG & CO2 emissions

The Lexus RX 450h is decently economical for a large SUV, and less polluting than most

MPG (comb) MPG (extra high) MPG (medium) CO2
37.1mpg N/a N/a 132g/km

The 3.5-litre V6 petrol engine under the RX 450h’s bonnet isn't a small engine and the 450h isn’t a small car. As a result, the MPG and CO2 figures aren't exactly startling, but they do make the Lexus more efficient than some of its diesel-engined seven-seater competitors.

Lexus RX 450h MPG

With only one powertrain to choose from, and relatively subtle trim grade differences, it’s not surprising that all variants of the 450h turn in similar numbers for economy and emissions.

That said, there's a small variance between the five and seven-seat models, and the choice of 18-inch or 20-inch wheels affects things, too. Around 35 to 37mpg is the official figure, and we've found that to be achievable in the real world.

CO2 emissions

At 132g/km for the entry-level version, the tailpipe emissions ratings for the Lexus RX 450h are good for an SUV, but it can’t compete with the lower ratings achieved by the PHEV brigade.