Based on the context and the answer, generate a question. 

Context: He adjusted the idle , and it purred like a kitten . Well , maybe a tiger . But it ran good . Sharon , Donald , and I , took a trial run out in the bay . It runs great!We are back in business!Back to the trailer to shower , eat dinner , and out shopping with Tom , Vi , and the kids .

Answer:

A car



What may of hummed like a tiger ?