you will most likely have mechanical pinch up to about a gallon and a half or two. then it will drop it nuts and when that happens you will know cause you will have to re-tune it a little. but you do not have to be easy on it. i normally i put a small race tune on mine right after break is done. but leave it rich just a little. after i get a couple of track races on it i think i go to a fall balls out race tune around the gallon mark. this is the same gallon i use for break in just so you know. i also think i play it a little safer then some might. some people are full race tune right after break in. but i play it safe cause the track will give it true testing in a race.