Every bit of weight counts against EV range just like it does against ICE fuel mileage, and so does the space it occupies. Other factors count may more, but weight is not trivial, especially since EVs are already heavier than their ICE counterparts because of the batteries. Space also drives overall volume of the vehicle, which directly impacts the shape and wind resistance, so eliminating the space occupied by the spare lets them use it for other things and contributes to range as well as cost targets.
Manufacturers try to squeak every bit of range that they can, especially since EVs are still notorious for not matching ICE vehicles in the range department.
Manufacturers try to squeak every bit of range that they can, especially since EVs are still notorious for not matching ICE vehicles in the range department.