Hi! While there are tires marketed as "electric vehicle" tires, they are not exclusive to electric vehicles and can be used on conventional petrol or diesel cars as well. These tires typically have low rolling resistance, which can help improve the range of an electric vehicle, but can also provide fuel efficiency benefits for conventional vehicles.
One potential disadvantage of using higher grade tires designed for electric vehicles on a conventional car is that they may be more expensive than traditional tires. Additionally, they may have a different tread pattern or rubber compound that is optimized for electric vehicle performance, which may not necessarily translate to improved performance or handling on a conventional car.
As for mixing EV and conventional tires, there are no specific rules or regulations regarding this, but it is generally not recommended. Mixing different types of tires can lead to uneven wear, poor handling, and reduced performance. It is generally recommended to replace all four tires at once to ensure consistent performance and handling.