Ive always been curious and it seems like nobody really answers the question, perhaps because the act of driving drunk is so faux pas:

If you know that you are drunk and you are pulled over, is it better to refuse the breath test or not?

The only advice I have ever heard which made sense didnt answer that question but suggested you stall as long as possible so that the maximum amount of time would go by before you take the 'official' test at the police station, which should in theory result in a lower blood alcohol percent.