Does my truck slow down when there are zombies on it?

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In Zombie Highway 2, the idea is that you kill zombies that hang on the side of your truck. Apart from the chance to flip over, are there any more downsides to let the zombies hang longer? I can shoot them to make them disappear as fast as possible, but I will run out of bullets. For example of downsides: do they slow down the truck?
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Zombie Apocalypse, But The Zombies Are Too Weak And Slow
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