Never drive in very small bursts as it can drain fuel. However, it's not long enough to gain any speed, and therefore is redundant. One example of this ineffective action can be found in the credits movie.
Only when used with the Flight Wing can you achieve proper flight, once over 300kph.
Use a full boost before going into the pits in Endurance Run as this will give you more speed and you will lose less time to other opposing racers.