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Vekke,
I think that is wrong. I've seen values of 17% total for tires, but that seems to be for the US EPA fuel economy test. Personally, I think 17% is too low.
But I don't think 50% is right either. If 50% were true, then changing tires should have drastic differences, and while they have differences, but it's more of the order of 10% change for fossil fueled cars. EV's would be better, but 50% sounds too high!
Plus there's the issue of not being able to eliminate a lot of the energy consumption tires contribute.
But if you're saying that tires contribute 50% of the energy consumption for a vehicle while it is traveling at a moderate speed, that might be true. But getting all that weight moving, then using regeneration braking as the only means for stopping the EV, there's losses in the braking that still makes that whole thing worse.
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