"We appreciate your insights and are thankful that your expertise has saved us from some unwise purchases."
"You...gave me all the information I wanted and then some, always explaining the technical details in an easily understandable way."
"You taught me more about cars than I would have expected to learn in the next 10 years."
"I'm amazed you make such a boring subject so interesting."
"I couldn't have found my dream car without your help and expert advice."