As someone who has never driven an s4 before....how do I know whether the car is performing properly on a test drive?
I should probably elaborate a bit

Sorry, I know its a bit of a "how long is a piece of string" type question but these are the sort of things that go through your mind when your weighing everything up. Just a bit worried whether I would know if the car was not "pulling" as hard as it should

Thanks again!
Nick