After the test drive, you should leave the car at lot. Why? Because you will probably need to drive other types of cars at other dealerships. It's a good idea to do all of your test driving in one morning or afternoon. Driving the cars back to back will help you uncover even minor differences, which will lead to a more educated purchase decision.

So, how do you get out of the clutches of the salesperson? Generally, Internet salespeople are pretty mellow and won't pressure you to buy on the spot. Besides, you can remind them you still have other cars to drive and you can't make a decision yet. Most good salespeople will respect that. If they don't, you probably won't be coming back to make a deal with them anyway.