how long?

i know this is the cavalier forum, but how manny miles does it take untill the new 05 2.2 ecotec gets broke in on a cobalt?

5 grand to be safe

ok, thanx alot. I just want to know how long it will. Because i wanted to see when the injectors are broke in so i can see what mpg i get, and after it is broke in i am going to run synthetic.