Vehicle shipping costs vary significantly based on the route, distance, carrier availability & timing. 

The mileage is a  big factor, but lane demand often has the most impact. A 300 mile move on a high deamnd lane can cost more than a 500 mile move on a less traveled route. Carrier price based on what it takes to make a route profitable, somtimes accepting lower rates on one route so they can get to a high-value route for the next pickup. The result is a market-driven price that changes often. 

Factors that increase price are high-demand routes, enclosed transport, inoperable vehicles, tight pickup or delivery windows & peak season moves; like NYC to Florida in the fall. 

Factors that can reduce cost are flexibility on pickup dates, open transport & routes with strong carrier avaialbility. 

Fuel costs are also major factors that can increase or decrease the cost a carrier will accept. Most open carrier options will be around $300-400 for short routes & $1,800+ for any coast-to-coast moves. That is just a ballpark number that will then take into account the above factors. 

The most accurate quote will always come from a broker who will manually price the route by checking live market rates on a specific route, rather then relying on an algorthim or static per-mile formula.