I work on game engines and the problem with floats isn't on small values like 10.01 but on large ones like 400,010.01 that's when the precision wildly varies.
> in the modern Fallout games2 the only vehicles of gameplay import are aircraft. The existence of ground vehicles is implied in dialogue, but we never see them, presumably because they’d be too difficult to implement in the engine.
It's more of a game mechanics issue than technical, there is a lot of rubble, obstacles and destroyed roads, specially the highways. Vehicles also make the world smaller. It might be fun anyway.