Cargo One
A more relevant analogy would be if your friend objected to the fact that the salesman had told him that his Bentley would do 1000 miles on a tank.
It never ceases to amaze me how guys who make billions - often through their attention to detail - will spend a fortune on lawyers going over the small print of the contract of sale, and yet never check with the tech guys what the salesman told him about the performance. Duh
