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Originally Posted by akwroclaw
I thought MB 190 sedan can also easily have such roof extender.
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The results on a sedan are less than on a car with a rear hatch like Piwoslaws 206SW.
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I drive 7 liters of gas in 100 km in long run [34 mpg]
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Given the weigh and size, that's certainly not bad.
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I have changed tyres from 195/60 R 15 to Michelin economy 175/50 R15 rear and 175/55 R15 front which made the car swinging lighter [ligther steering wheel action and whole vechicle lighter mobility]
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Narrower tyres will help, but their overall diameter is a lot smaller than the 195/60 !
The 175/55 front tyres are 6,8% smaller ; the rear 175/50 tyres are 9.6% smaller, so they turn almost 10% faster, meaning your engine does 10% more rpm.
And that's not good.
Are you compensating for this difference ?
Because your car will show 7% or 10% more kilometers than it is really doing (depending on where the speed / distance is measured).
You can compare tyre sizes here :
Tire Size Calculator - tire & wheel plus sizing