Best cars for fuel economy 2019

Spend less filling up and cut emissions too: these are the best petrol, diesel and hybrid cars for fuel economy

Dominic Tobin
Feb 26, 2019

You don't need an electric car to cut your fuel costs.

Manufacturers may be investing billions of pounds to develop new electric vehicles, but at the same time, they are also making their existing petrol, diesel and hybrid vehicles more efficient.

Tougher tests, required of all new vehicles, mean that fuel economy figures are more accurate (but not perfect) and emissions from the very latest cars are much cleaner in real-world driving.

If you're looking to maximise your fuel economy, then the best type of car for you will depend on how you drive. If you can charge up at home, then a plug-in hybrid car is worth considering. They use barely any fuel on journeys up to 25 miles long, when fully charged, and are increasingly efficient on longer trips too.

They are more expensive than a conventional hybrid car, though, which is extremely efficient in slower town driving. Petrol cars are cheap and excellent all-rounders, while diesel cars excel at long distance driving.

We've listed the most efficient cars from each group below. We've only included vehicles with fuel economy figures generated from the latest official fuel economy test, known as WLTP, which provides a more realistic estimation of real-world conditions.

All of the cars are on sale from new and available used as well. If you do opt for diesel, then it's worth ensuring that it complies with the latest emissions standards, known as Euro 6, to avoid inner-city emissions charges. Since September 2015, virtually every new car has met this standard.


Best cars for fuel economy


Best plug-in hybrid cars for fuel economy

Hyundai Ioniq PHEV

Latest Hyundai Ioniq PHEV deals from £20,500
Finance from £303 per month 

Hyundai Ioniq PHEV 247.8mpg / 26g/km CO2

It's hard to look beyond the official fuel economy and CO2 figures for the Hyundai Ioniq, which hint at a single, annual trip to the petrol station and emissions that are cleaner than the air that you breathe.

But the outstanding aspect of the Hyundai is what happens once you've got beyond the range of the fully charged battery (around 25 to 30 miles). Because although the fuel economy isn't close to the headline figures (you'll be visiting the petrol station more frequently than one a year), you can still achieve around 70mpg by driving smoothly. That's better than any standard diesel or petrol car.

Prices are reasonable too, now that used versions are available from BuyaCar at prices starting from £20,500. CO2 emissions are also well within the lowest company car tax band, ensuring low rates for business users. Just don't confuse the plug-in car with the standard, less-efficient Ioniq hybrid.
Hyundai Ioniq buying guide


Toyota Prius Plug-in

Latest Toyota Prius Plug-in deals from £21,594
Finance from £273 per month 

Toyota Prius Plug-in 235mpg / 28g/km CO2

There's really very little to split the Toyota Prius Plug-in from the Hyundai Ioniq. Both cars can power themselves for around 30 miles with a fully-charged battery pack, and both qualify for low company car tax. They are also evenly matched when it comes to long-distance fuel economy, which can average around 70mpg as long as you're gentle on the accelerator.

However, the Prius falls behind when it comes to real-world practicality: the 191-litre boot is tiny, particularly compared to the 341 litres available in the Ioniq.


Kia Niro PHEV


Kia Niro PHEV 201.8mpg / 31g/km CO2

The large Kia Niro doesn't look particularly efficient, but that's part of its appeal: it's a popular crossover car, which uses the same mechanical parts as a conventional hatchback, but packages them in a taller shape for a higher driving position and a little more space.

When fully charged, its battery pack can power the car for around 25 miles, although the petrol engine does boost power when accelerating or going up hills. Despite lower official fuel economy figures than the Prius and Ioniq above, real-world efficiency is similar, so 65-70mpg on a motorway journey is achievable.
Kia Niro buying guide


Best hybrid cars for fuel economy

Hyundai Ioniq

Latest Hyundai Ioniq hybrid deals from £15,380
Finance from £216 per month 

Hyundai Ioniq Hybrid 62.8mpg / 84g/km CO2

The Hyundai Ioniq hybrid may be less efficient than the plug-in version, but fuel economy is impressive for a hybrid car. Used car prices are increasingly affordable and the car's five-year warranty matches the cover offered by Toyota.

The Ioniq is also a good car in general. It's comfortable, quiet and has enough space to carry a car-load of adults.
Hyundai Ioniq buying guide  


Toyota Corolla

Toyota Corolla Hybrid 62.7mpg / 76g/km CO2

Toyota made hybrid cars mainstream with its Prius but the latest car doesn't make this list because the company hasn't yet published the vehicle's fuel economy figures from the latest official tests. The same technology features here in the new Toyota Corolla, though.

You may find the design of the car more appealing than the quirky Prius, and it's also nimbler to drive, with a sharper response when turning in to corners. Efficiency is similarly high, with the biggest gains to be made in slow town driving, where the hybrid system recovers energy usually lost during braking in stop-start traffic.


Lexus CT

Latest Lexus CT 200h deals from £12,450
Finance from £198 per month 

Lexus CT 200h 59.3mpg / 101g/km CO2

The Lexus CT is efficient, which is fortunate because the ageing hatchback has fallen behind the competition in other areas. The quality that sees Lexus regularly topping reliability charts is in evidence, but the car is firm over bumps, making life uncomfortable for passengers over unmade roads. It's cramped in the back too.

The advantage of having been on sale for several years is that used cars are cheap.
Lexus CT buying guide


Best diesel cars for fuel economy

Peugeot 208

Latest Peugeot 208 diesel deals from £5,600
Finance from £89 per month 

Peugeot 208 1.5 BlueHDi 100 67.7mpg / 95g/km

In some ways, this Peugeot wins the category by default because there are decreasing numbers of small and light cars that are fitted with diesel engines. That's partly down to reduced demand for diesel, and partly because diesel engines aren't suited to the shorter journeys that these cars often do. If you're covering fewer miles then the extra efficiency of diesel over petrol is less likely to repay the higher purchase price, and the exhaust filters that clean up emissions can easily become clogged without regular high-speed trips.

But if you are looking for a small car to cover long distances, then the Peugeot 208 is a decent choice. It will soon be replaced, so new car discounts are plentiful and used cars are cheap. It's smooth during motorway driving (but can become unsettled over bumps at slower speeds) and fuel economy in the real world is around 56mpg.
Peugeot 208 buying guide


Ford Focus

Latest Ford Focus diesel deals from £7,399
Finance from £121 per month 

Ford Focus 1.5 EcoBlue 95PS 64.2mpg / 91g/km CO2

Ford's new range of diesel engines are badged EcoBlue, promising extra efficiency and reduced emissions. it performs well in the official fuel economy measure but real-world testing, published by the Equa Index, shows that you'll see around 48mpg in normal driving.

Carbon dioxide emissions are below 100g/km, bringing low levels of company car tax and the car is quiet - once you've got it up to speed.
Ford Focus buying guide


Citroen C3 Aircross

Latest Citroen C3 Aircross diesel deals from £12,750
Finance from £198 per month 

Citroen C3 Aircross BlueHDi 100 63.1mpg / 103g/km CO2

The C3 Aircross is unashamedly family-friendly, avoiding sleek styling and a sporty driving feel for comfort and practicality. The diesel version is a good choice, providing a shove of power without the need to rev the engine, which makes driving quieter and more relaxing.

Crucially, the car is efficient on public roads, without having to adopt a frugal driving style. Real-world testing , published in the Equa Index, estimates that 56mpg is a realistic expectation: a figure that's better than the Ford Focus, above, despite that car's higher official figure.
Citroen C3 Aircross buying guide


Best petrol cars for fuel economy

Suzuki Celerio

Latest Suzuki Celerio deals from £5,000
Finance from £86 per month 

Suzuki Celerio 1.0 58.9mpg / 89g/km CO2

The key to making an efficient petrol vehicle is to start off with a car that's small and light and then to fit it with a small and light engine. The results are diesel-rivalling fuel economy figures, but performance isn't a priority.

And so, you'll need to wait 13 seconds for the Suzuki Celerio to accelerate from 0-62mph - longer if you're driving efficiently, with a light touch on the accelerator. Real-world fuel economy of around 55mpg is remarkably close to the official figure. This is a car that leans in corners, bounces over speed bumps and has a plasticky interior, but it's one of the cheapest cars on sale today, so you'll be spending very little money all round. 


Citroen C1

Latest Citroen C1 deals from £4,480
Finance from £70 per month 

Citroen C1 VTi 72 57.3mpg / 93g/km CO2

If you've recently passed your driving test, then there's a good chance that the Citroen C1 is on your list of potential first cars. It's cheap, with low insurance costs and - from new - available with Citroen's SimplyDrive finance, a 'Fuel and Go' package that includes the cost of finance, insurance, servicing and tax in a single monthly payment.

The Citroen is efficient too. Real-world testing published in the Equa Index estimates that you can expect 52mpg, although acceleration is slow. It looks distinctive and newer versions come with modern gadgets, including a touchscreen with Apple CarPlay and Android Auto with all but the entry-level Feel models.
Citroen C1 buying guide


Peugeot 108

Latest Peugeot 108 deals from £4,295
Finance from £67 per month 

Peugeot 108 1.0 57.3mpg / 93g/km

Underneath the metal, the Peugeot 108 uses exactly the same components as the Citroen C1 (both brands are owned by the same company) so it's no surprise that fuel efficiency and emissions are identical. Like the C1, new Peugeot 108s are available with all-inclusive 'Just Add Fuel' finance, while used cars come at extremely reasonable prices.

Real-world fuel economy of 52mpg, should keep petrol station visits to a minimum, even though performance from the 72 horsepower engine is pedestrian - just as it is with the Citroen C1.
Peugeot 108 buying guide


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