Parkers overall rating: 4 out of 5 4.0

Miles per pound (mpp) Miles per pound (mpp)

Petrol engines 7.2 mpp
Hybrid petrol engines 7.6 - 7.7 mpp
Low figures relate to the least economical version; high to the most economical. Based on WLTP combined fuel economy for versions of this car made since September 2017 only, and typical current fuel or electricity costs.

Fuel economy

Petrol engines 33.6 mpg
Hybrid petrol engines 35.7 - 36.2 mpg
  • RX 450h surprisingly frugal…
  • …If you drive carefully
  • Most efficient around town 

Now fully tested under the more stringent WLTP cycle, the Lexus RX claims combined fuel consumption of 35.3 to 35.7mpg. As for CO2 emissions, the Japanese SUV weighs in with 134g/km.

Pre-2020 running costs

Under NEDC testing RX boasted up to 54.3mpg (for an SE-spec car), but this was a hard figure to achieve. If you bought a higher-spec RX, the claimed fuel economy dropped to 51.4mpg due to the slightly larger alloys fitted to the car.

We found it possible to achieve close to 50mpg, though, without being too slow and careful to eke out every ounce of fuel left in the tank.

Take maximum advantage of that smooth 3.5-litre V6 power however and you’d easily see the figure dip closer to 30mpg.

We did find ourselves confused by the lack of a plug-in hybrid option. It’s technology Toyota has in its arsenal for the Prius, so it’s a little difficult to understand why the firm isn’t using it here to drive CO2 output down even further.

As with many cars, the amount of CO2 produced in by the RX 450h depends on the size of the alloy wheels fitted.

2019 Lexus RX side profile white

The emissions star used to be the entry-level SE model due to its 18-inch alloy wheels, producing just 120g/km of CO2. If you wanted a higher-spec model with larger wheels, emissions crept up to 127g/km with the largest set of 20-inch alloys on an F Sport model. Even then it was an impressive figure for a large, powerful SUV.

Reliability

  • Very little to worry about here
  • Lexus has an excellent reputation
  • Dealers pleasant to visit, too

You’re unlikely to have many (if any) problems with your RX. Lexus and parent company Toyota have built up stellar reputations when it comes to reliability, with a solid build being a Lexus hallmark.

The cabin is beautifully made and the powertrains available are evolutions of tried-and-tested set-ups found in several other models sold around the world.

There has been one recall that’s affected the RX, however, issued in 2016 and affecting a small number of examples built between November 2015 and June 2016.

It’s related to a potential issue with an airbag deploying incorrectly, but if a car you’re thinking of buying was built between these dates, check it has been taken back to a dealer and sorted out.

Otherwise owning a Lexus RX should be very much trouble-free. And if you do have to pay the dealer a visit, they have a reputation for being some of the most customer-friendly out there.

Ongoing running costs

Road tax (12 months) £20 - £475
See tax rates for all versions
Insurance group 34 - 43
How much is it to insure?