We the viewers, to enjoy this episode, must believe that Hank Hill has never known that people commonly haggle over car prices. We must also believe that Peggy, who was once scammed out of $1,000 by the promoter of an online IQ test, DOES know about car pricing and can bargain with a salesman better than Hank. If you believe those premises make no sense, you are absolutely correct. If we ignore those absurdities it is a comical episode, and Hank, at the end, gets "back into character" as the man we know he is. The episode would've been one of the best if only Hank's and Peggy's actions had been completely reversed - as they would have been in the KOTH universe.
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