Is it rude to test drive a car if you don't intend to buy it?

I am looking to buy a Toyota MR2, and I have found a good deal on ebay. It's out of state, so I'll have to get it shipped to my home. It's got a clean CARFAX and the pictures look good, as well as its low mileage. Is it okay to go to a used car dealership near my house to test drive one? The one at the dealership near my home is salvaged, higher mileage, older, and more expensive than the one on ebay, even with the added shipping cost. Is this okay from a legal and/or ethical standpoint? Thanks!