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    Does E10 petrol increase fuel consumption?

    Ethanol content and real-world consumption.

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    Short answer

    VTT Technical Research Centre of Finland tested six used E10-compatible cars from model years 1999–2010 in laboratory conditions in 2011. On average they used 10.30 litres of 95E10 and 10.23 litres of 98E5 per 100 km, a difference of about 0.7%. Ethanol has a lower energy content than petrol, which explains the small increase. Moottori notes that this difference is unnoticeable in everyday driving and that 98-octane petrol rarely saves enough fuel to cover its higher price.

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    Why

    1. About 0.7% higher with E10.
    2. Measured by VTT in 2011.
    3. Unnoticeable in daily driving.

    Details

    VTT measured 10.30 l/100 km with 95E10 and 10.23 l/100 km with 98E5.

    Tip

    Compare the litre prices: the cheaper 95E10 usually wins if your car accepts it.

    What may differ

    The study used six cars; individual cars may differ.

    Common misconception

    E10 petrol raises consumption by several percent.

    What actually happens

    VTT measured an increase of only about 0.7%.

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    Sources

    This answer is for reference only. Traffic rules and fees change, so check Traficom, Liikenneturva or the police before you drive.

    Transport, roads, car rental

    • Do foreign cars need a country sticker in Finland?

      The Automobile and Touring Club of Finland says a nationality sign is required on foreign cars in Finland, unless the vehicle is registered in a country that is party to the Geneva or Vienna Road Traffic Convention and carries EU number plates with the country code.

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    • What colour are motorway and main road signs in Finland?

      The Automobile and Touring Club of Finland (Autoliitto) says main roads in Finland have blue direction signs with white text, while motorways have green signs with white text.

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    • Which petrol should you use in Finland, 95E10 or 98E5?

      Finnish pumps sell two main petrol grades: 95E10, with an octane rating of at least 95 and up to 10% ethanol, and 98E5, with at least 98 octane and up to 5% ethanol.

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    • How should you transport a dog in a car in Finland?

      Taloustaito, interviewing the Finnish Kennel Club, says that under the Road Traffic Act a dog is treated like a load that must be secured so that it causes no danger, and it may not move freely in the car.

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