I’m planning to tile the floor of the garage my Westfield will be living in. Having taken advice (here in Malta) it appears plenty of people here use ordinary porcelain floor tiles. I guess it might be a different story if you’re planning to park a big truck on the floor or use the garage for serious mechanicing but body colour porcelain won’t show minor chips and is easily durable enough for a cosseted private car. Plus it should be frost proof which isn’t a concern for me but might be for you. I’d look at trade/commercial tiles as used in shops and other high traffic areas.