Minimum broiler feed requirement (gram/day or gram/bird weight) for its survival and min. requirement for maximum weight gain

We always feed ad libitum the entire period to support maximum growth, which minimizes the growing period and thus reduces overall maintenance allocation for best FCR.

This is a good question, but I think no one can answer you. Because most of people feed their broiler ad-libitum. The only feed restriction when the light off.

Good topic
Here we give more importance feeding broiler chicks up to 2 wks by using.prestarte at 400 g per chick to get around 400 g body wt.
Then follow stater feed till 25 days @ 1000 g of feed per bird which is followed by feeding finisher feed up to 35 days to get 2 kg body wt and 1.55 FCR.
The above routine is followed with most of the farms.
Lighting is restricted for first 10 days with brooder temp and brooding house temperature and proper ventilation.
Regards.

Pls, what is the required % cp and energy in kcal per kg for prestarter, starter and finisher diets?

Lighting program followed by Sushi Chandra not understood.
Restricted for 10 days?
Full lighting program may be given. Mohammed farooq got 1.5kg weight with 2.5kg feed, I guess?

How about using 80 g pre-starter and 1000 g starter then followed by feeding finisher feed up to 35 days to get 2 kg body wt with 1.45 FCR this by using feed restriction for 6 hrs daily?

There are calculations in the literature to calculate the energy requirement per given weight. Brody formula is body weight raised to the power of 0.65. the feed for added growth is calculated at 1.5 FCR.
an other way we tried is full feeding of broilers with pre starter and starter. the approximate feed consumption on 22nd day is around 80gms. we found that the daily feed on ad libitum feed at 40days is around 150gms. we hypothesized and tried limited feeding. we took base feed on 21st day as 80gms. keep adding 3 to 4gms per bird per day on daily basis. this avoided excess feeding especially in hot months resulting in less day mortality and better FCR.
Worth trying. The flocks which achieved about 800gms on 21 days did well on this program.

Broiler good FCR depends on feed and water quality, farm house location and management. In cold areas there's more feed consumption than warm areas in farm houses.