It's an individual time trial in the Giro d'Itiala today so I thought I'd share some wisdom from an ex professional cyclist.
A few years Chris Boardman did a feature on the mentality of the individual time trial. You set off and you set a pace. You ask yourself "can I keep this up until the finish?" If the answer is yes - you're going too slow. If the answer is no - you're going too fast. The answer you want is "maybe..."