Audi A3 Sportback hatchback - MPG, running costs & CO2

Audi is broadening the choices offered to A3 owners, so while petrol and diesel engines are available, these options are bolstered by mild-hybrid technology and the arrival of a fully fledged plug-in hybrid A3 40 TFSI e. The latter uses a petrol engine, electric motor and battery to provide an electric range of around 41 miles, slashing fuel use and CO2 emissions.

Audi A3 MPG & CO2

Sticking with petrol first, the 148bhp 1.5-litre '35 TFSI' petrol engine has the option of mild-hybrid technology, incrementally increasing fuel-efficiency and cutting CO2 emissions. This will arrive shortly after launch, but until then the standard engine is hardly a gas guzzler, managing up to 48.7mpg with a manual gearbox. With emissions from 132g/km, it's also affordable for company-car drivers thanks to a reasonable BiK band.

During hundreds of miles of mixed driving, we found the 1.5-litre petrol even more economical than advertised, managing exactly 50mpg. This is impressive for a petrol family car, and helps make the A3 a great all-rounder.

The smaller 1.0-litre petrol engine is badged as ‘30 TFSI’ and is capable of up to 51.4mpg when the car has 16-inch alloy wheels fitted. Its emissions figure of 124g/km places it in a relatively high BiK band.

Topping the economy charts is the 40 TFSI e plug-in hybrid, which is officially capable of around 41 miles of pure-electric running and economy of up to 282.5mpg. Emissions of 25-30g/km give the A3 PHEV a low BiK banding, meaning it’s the model that will appeal most to company-car drivers. The 13kWh battery can be charged in around four hours using a home wallbox.

Choose the 35 TDI diesel, perhaps if you have a high annual mileage, and you can expect up to 61.4mpg. BiK payments will be higher, with CO2 emissions from 120g/km, depending on which trim level and alloy wheels are selected. A 30 TDI with 114bhp is also available with even better efficiency figures, returning up to 64.2mpg with emissions starting from 115g/km.

Insurance groups

Choose a 1.0-litre Audi A3 30 TFSI Technik and insurance groups start from 17, while a more powerful A3 35 TFSI Edition 1 is in group 26 out of 50. That's the same rating as the diesel A 35 TDI in S Line trim.

Warranty

Audi provides a three-year/60,000-mile warranty, which is fairly average for the class and can be extended for an extra cost. Increasing it to four years and 75,000 miles costs £300, while a five-year/90,000-mile warranty is just over £600 extra, despite a five-year/100,000-mile warranty coming as standard with a Hyundai i30 or Toyota Corolla.

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Servicing

Audi typically offers customers two servicing plans: one for low-mileage drivers who are likely to take more short trips, and another for motorists who have a higher mileage and tend to take longer motorway trips. The first sees maintenance take place annually, while the latter uses sensors to measure wear and suggest a service - although these will never be more than two years apart.