the s.boost does nothing? It does not speed up at all after picking up a mansion, even if the mansion triggers Momentum, it still lasts only for a short while and the mass gain does not increase. At least I don't see it.
protip: farm the "difficulty 9" stack in the third dungeon. It always gives you enough money to buy two 100 damage scrolls and after using them, finishing the enemies is a piece of cake. Free exps
I could run up to 1100 metres until I bought some upgrades, I'm not sure which ones (I guess the car or probably the minigun). Since then, my game looks like this: I start in the car, I drive for about 800m until it gets destroyed. I have a team of approximately 5 dudes. We run for about 30 metres, kill some lone soldiers. Then a first wave of those fast cars with miniguns come by, we kill some of them using Napalm, right after that another wave comes by, and I'm left with half dead commander. Usually this second wave of minigun cars is followed by a huge army of soldiers with 2 bunkers on 1 screen and my half-dead commander can't do nothing.
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:)