Under rating threshold (hideshow)
grrrr i ts hard to get 6k if you dont know any pattern, i learned a patteren myself... every upgrade then rocket 1/4 of fuel then go up down up down up down ect until speed or altitude is low, then use 2/4 or a little more of fuel leaving 1/4 or a speck. go up down up down up down ect until you are almost out then use the rest and you know what to do next... :P