effect larger tyres and wheels have on economy - Hyundai Forums : Hyundai Forum
 
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post #1 of 2 (permalink) Old 08-10-2016, 05:11 PM Thread Starter
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effect larger tyres and wheels have on economy

I was looking at HYUNDAI MOTOR REVEALS FULL PRICING AND SPECIFICATION OF IONIQ : Hyundai Media Centre


and noticed the economy and emissions figures



FUEL CONSUMPTION & EMISSIONS

Ioniq SE, Premium, premium SE with std 15" wheels and 195/65 R15 rubber
Urban mpg (l/100km) 83.1 (3.4)
Extra urban mpg (l/100km) 78.5 (3.6)
Combined mpg (l/100km) 83.1 (3.4)
C02 Emissions (g/km) 79

Ioniq premium SE with option 17" wheels and 225/45 R17 rubber
Urban mpg (l/100km) 72.7 (3.88)
Extra urban mpg (l/100km) 71.9 (3.92)
Combined mpg (l/100km) 70.6 (4.00)
C02 Emissions (g/km) 92


two things caught my eye


first is the decrease in MPG with the 17" wheels WHY? (9-13% increase in fuel consumption for having bigger wheels)


and the extra urban figures are lower MPG than the urban ??, does the electric motor really make that much difference round town to consumption?


I have noticed similar figures on the new Kia Niro, bigger wheels = lower fuel economy and higher emissions


a bit of a google turns up Effects of Upsized Wheels and Tires Tested - Tech Dept. - Car and Driver , quite a good test with lots of data and the methodology of their process


the most interesting bit is the image of the results



you notice the bigger wheel / tyre combo are heavier, and also wider meaning more rolling resistance, is that enough,


so if you want better economy time for you and your family to hit the diet ?

they also have a smaller (about 5%) impact in 0-60mph times


but the bigger wheels due to wider tyres have slightly more grip in both cornering and braking distance


will this mean the trend to larger wider tyres will start to reverse as manufacturers look for easy wins to reduce average emissions figures to meet EU 2020 emissions regs?
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post #2 of 2 (permalink) Old 08-11-2016, 08:26 AM
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The type of wheel can make a difference as well. Some are just heavier than others. On my last car the stock wheels were a 16 cast aluminum with a 215/55R16. I swapped those out later for some factory forged aluminum 18" and ran a 245/40R18 on those. Overall height was only .2" shorter and my mileage didn't suffer.

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