Here is my understanding of Grease having checked my marketing booklet.
First of all,
It was available as,
1 x 200ft selected scenes,1 x 400 selected scenes,
3 x 400ft mini feature
Full length Marketing feature , (it doesn't state how many reels, only full feature)
If there was a 4 x 400 feature it may have been an overseas sale only. Marketing did quite a few of the USA sales only.
Derann did the full 7 x 400ft feature in scope which we have
also the 200ft summer nights sequence in scope which also contained the opening titles.
Before i got hold of the Derann scope feature we bought what was advertised as the full marketing feature, this was on 2 x 800ft reels and i was a bit surprised but understood the polyester extra thin stock. The film had good focus, good colour and very good mono sound, but when we viewed it the whole Greased lightning number was missing along with footage before and after, this is when we had no choice but to return it. it was pure luck that i got an e mail from a fellow American collector who informed me that Mr Osborn had a full Derann feature in scope for sale, it was also re-recorded into stereo and came mounted on 2 x 1200ft spools.
The full marketing feature would go onto 2 x 800s but they would be very full spools as this film runs for 110 minutes.