Carvana Co. is launching its free, as-soon-as next-day vehicle delivery service today in Tucson, the second market in its home state of Arizona. The Tempe-based used car online retailer is marking its 41st market in Tucson as it continues expanding across the country. Since Carvana opened a vehicle inspection center in Tolleson in September, it gives the company more options for West Coast expansions and customers, said Ryan Keeton, Carvana’s co-founder and chief brand officer. “Our logical…