In-depth Reviews

Audi A4 saloon - MPG, running costs & CO2

The greenest Audi A4 model can return over 50mpg

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MPG, running costs & CO2 Rating

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Audi has gone to great lengths to improve the Audi A4's fuel-efficiency figures. It's not as if the old car's CO2 emissions and fuel economy were bad in comparison to rivals – far from it – but Audi has to keep cars like the refreshed BMW 3 Series and hi-tech Jaguar XE at bay in order for the A4 to remain competitive.

Audi A4 MPG & CO2

Like many compact executive cars, the Audi A4 has a huge range of engines to choose from and mild-hybrid technology has been rolled out to boost fuel-efficiency and help cut CO2 emissions. It works by capturing energy while the car is slowing down and using it to power the car's electrical systems. The most economical engine in the range is the 2.0-litre diesel; both the 134bhp ‘30 TDI’ and 161bhp ‘35 TDI’ are capable of up to 55.4mpg in trims with smaller wheels. The A4 now has a reduced engine range to choose from, but all are relatively frugal. The more economical diesels are best for high-mileage drivers, but heavier tax means petrol models are often now more appealing for company-car drivers.

A more powerful, 187bhp version of the 2.0-litre diesel engine is also available with standard quattro all-wheel drive. Badged 40 TDI, it promises fuel economy of up to 48.7mpg. Other engine highlights include a 2.0-litre 35 TFSI petrol with 148bhp, which is capable of up to 42.2mpg and is the least expensive engine in the range to buy.

There are further petrol choices, as you can order an A4 with either 187bhp or 242bhp. While these are very smooth, they're best for low-mileage drivers as fuel economy is up to 42.2mpg and 36.7mpg respectively.

After the first year's CO2-based road tax (generally included in the on-the-road price), all Audi A4s cost £150 a year to tax. Those with a list price (including options) of more than £40,000 are liable for an additional surcharge of £325 a year in years two to six, bringing the annual bill to £475 during that period.


The entry-level petrol 35 TFSI sits in group 23, while the 40 TFSI in Sport trim climbs to group 29. The 30 TDI starts from group 22 out of 50, while the range-topping diesel S line 40 TDI quattro is in group 30.


Audi's warranty looks a little stingy in the face of its competition; its three-year/60,000-mile cover is pretty standard fare, with BMW and Mercedes providing unlimited-mileage cover over the same time period. The standard warranty can be extended to four years/75,000 miles for £385, or five years/90,000 miles for £905.

Audi covers the paint for three years, and offers a guarantee against corrosion for 12 years. Again, this is on a par with rivals.


Audi offers fixed service intervals of 9,000 miles or once a year, or flexible servicing that can see drivers cover up to every 19,000 miles or two years for the major between services. Flexible servicing is recommended for drivers with a high annual mileage, while fixed servicing better suits town and city drivers making frequent, short trips. Audi offers owners a range of fixed-price service deals.

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