In-depth reviews

Lexus IS 300h (2013-2020) MPG & CO2 emissions

The Lexus IS 300h looks clean compared to diesels, but plug-in rivals are better still

Lexus IS 300h
Overall rating

2.0 out of 5

MPG & CO2 emissions rating

2.0 out of 5

MPG (combined)MPG (high)MPG (low)CO2 emissions
44-49mpg53mpg44mpg133-144g/km

When compared to more traditional choices, there’s no doubt the Lexus IS 300h offers an appealing option for emissions-minded motorists. However, the CO2 output is a little high next to alternative hybrids including Lexus' own ES.

Lexus IS 300h MPG

Our own experience with the Lexus IS 300h is that you’ll struggle to achieve the officially quoted consumption of just under 50mpg. When our sister title Auto Express had one on the fleet, it recorded an average of 41mpg – that’s a little worse than the sort of real-world consumption you might expect from a comparable diesel, but a long way off the quoted figure.

CO2 emissions

Lexus has recorded official CO2 tailpipe emissions figures of 133-144g/km for the IS 300h. While that’s good in comparison to the numbers quoted for traditional diesel or petrol executive models, it’s hardly noteworthy if you’re looking at the latest batch of plug-in hybrids, and even the bigger and more luxurious, yet more efficient Lexus ES

In fact, the IS 300h sits much closer to traditional diesel executive cars like the Mercedes C-Class and BMW 3 Series than it does the PHEVs. The overall value of the hybrid system depends on the type of mileage you cover, and your driving style.

Use a Lexus IS 300h a lot around town, and you’ll get maximum benefit from its electric motor. If you do a lot of B-road mileage, or want to make the most of the power and grip, the numbers will inevitably suffer. Ultimately, the IS is an older car and its emissions and real-world economy are looking less than impressive next to more modern rivals. 

Most Popular

Best plug-in hybrid cars 2021
Skoda Superb iV
Best cars

Best plug-in hybrid cars 2021

The best plug-in hybrid cars offer great fuel economy and very low running costs as long as you keep their batteries charged
17 Feb 2021
Volkswagen ID.1 on the way as Polo-sized entry-level electric car
Volkswagen ID.3
Volkswagen

Volkswagen ID.1 on the way as Polo-sized entry-level electric car

Volkswagen is working on a small electric car based on its MEB platform; Cupra and SEAT models also on the cards
24 Feb 2021
Aston Martin plans for 90% electrification of its range by 2030
Aston Martin badge
Aston Martin

Aston Martin plans for 90% electrification of its range by 2030

British luxury brand confirms that it has plans for an electric car and plug-in hybrids as 2030 ban looms
25 Feb 2021