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Thread: Wider tires = more gas consumption?!

  
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    Wider tires = more gas consumption?!

    I do not know how accurate the theory or is it a myth of my friend. He told me that if you use a wider tyres the tendency is to consume more gas coz their are more tyres on the road thus the engine needs more power to run the car thus it consumes or needs more gas to run. it may sound logical in theory but in reality I have no idea? Your inputs pls..

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    wider tryes wont have as much effect as tyre pressure. lower tyre pressure increases rolling resistance, wider might, but only very slightly.

    however low pressure in wider tyres would be much worse :P
    324hp @20psi
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    It shouldn't do!!

    As the weight of the car hasn't changed, nor the tyre pressure, then the actual contact area (footprint) of the tyres on the road will be the same

    As above - tyre pressure has more of a bearing on ecomony

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    Then how come the Astra Eco4 came with 165s on it?
    2007 Metro Blue 5 door Mk5 Elite 1.7CDTI
    6th Vauxhall (4th Astra) in 10 years...plus a couple of other sheds...

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    They were "specal" tyres with a low rolling resistance

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    wider tyres will have more grip - and therefore more rolling resistance. There will be a slight fuel loss from fitting them.

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    Also the CO2 emissions increase with wider wheels, which to me says the engine is needing more fuel for the same go. I've seen in the brochures where cars fitted with the bigger (so therefore wider) wheels have a different CO2 emission rating.
    2007 Metro Blue 5 door Mk5 Elite 1.7CDTI
    6th Vauxhall (4th Astra) in 10 years...plus a couple of other sheds...

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    A wider tyre will cause more aerodynamic drag than a skinny one. So the higher your Cd (drag coefficient) is the more fuel you will use to get to and maintain the same speed as the car on the skinny tyres.

  9. #9
    Milzy
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    Well, after getting alloys for my old ECO-4, the mpg most definitly decreased compared to running them pencil tyres. However, handling was much improved

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    A significant proportion of the tyre frontal area is below the wheelarches / bodywork so wider tyres have more aerodynamic drag as well as greater rolling resistance - so yes it does go up.

    This is sometimes obvious in official fuel consumption figures where the only difference between two models is the tyre width.
    Maintains:- Vectra Design 1.9CDTi
    Drives :- Hyundai Santa Fe


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