With the current version of FAR, I'm getting about 6,700 ∆v to LKO. The rebalancing of stock parts to suit 3,300 ∆v rather than 4,500 ∆v however probably means 64k still represents accurate payload fractions. I've a 725 ton 2 stage lifter capable of lifting at least 27 tons to 100km (3.6%) and a 1,968 ton 2 stage +boosters lifter capable of at least 89 tons (4.3%). They could both use some optimization so I'm hoping to get those numbers a little higher, but they're already reasonable numbers.
