Subaru Impreza STi (2008-2008) running costs and reliability

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Running costs rating: 2 out of 52.0

Written by David Ross Published: 6 June 2019

Miles per pound (mpp)

Reliable fuel consumption data for comparison purposes is not available for this model.

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Fuel economy

A more stringent standard for fuel economy (WLTP) was introduced from September 2017, and this model was not required to undergo that test. Its fuel economy measured under the previous test system was 23 - 27 mpg. However these figures are less likely to be achievable in real world driving and so should never be compared to another car's mpg which was measured under the newer, more realistic WLTP system.

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With supercar performance it is little surprise that the Impreza is expensive to run. Insurance is group 19 (the highest is 20), you’ll be lucky to see more than 25mpg in everyday driving while road tax is also expensive. You also need to take into account the price of replacing tyres (they aren’t cheap) while service intervals are only 10,000 miles.

With CO2 emission of 243g/km the Impreza WRX STi isn’t an eco-friendly choice. Economy is poor too and the Subaru will only average 27mpg according to the manufacturers’ figures – although it’s difficult to achieve this in real world driving. The 330S is even less efficient – it averages just 24mpg and emits 281g/km of CO2.

Subaru has a good reputation for build quality and the previous Impreza proved its worth as a rally car. The engine has been carried over from the previous car, where it was renowned for its reliability and durability, however the interior feels a little flimsy and not particularly robust.