On a new lawn, with newly emerged weeds, herbicides with either no surfactant or 8-16 oz per 100 gallons will work. I go for the minimum needed to effect wetting and penetration. It is very different from treating old lawns with weeds that are supposed to be annuals but have turned into woody perennials.
They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety.
Benjamin Franklin 1775
Sell not virtue to purchase wealth, nor Liberty to purchase power.
Benjamin Franklin Poor Richard's Almanac1738