It's always better to speak the language of the team. Not only for the direct contact with everyone - sometimes it also helps you to understand the mentality of the people in the team a bit better.
When I test I never go right to the limit. Only because when you are below the limit you can go at the same speed all day, and that's the only way you can be absolutely sure about what you are testing.
Without going to what I think is my limit. I always say that my ideal is to get pole with the minimum effort, and to win the race at the slowest speed possible.
You want to have fun but you also want to work well. Sometimes I was quite happy at Ferrari, because we would have fun, but then they could not stop having fun and go back to the real work.
