Correct answer
It may increase consumption through greater rolling resistance.
It may increase consumption by raising rolling resistance and tyre deformation. It also promotes heating and can impair safety and service life. The amount depends on underinflation, vehicle, tyres, load and use: there is no universal 5% cap or fixed 5–7% summer increase for all vehicles.
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It guarantees lower consumption in every vehicle.
It cannot affect rolling resistance or fuel consumption.
It may increase consumption through greater rolling resistance.
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