I would note that delta v from LEO to mars orbit is 7500m/s, which would only need ~40kg of fuel from your calculations (didn’t recalculate with additional fuel

I would note that delta v from LEO to mars orbit is 7500m/s, which would only need ~40kg of fuel from your calculations (didn’t recalculate with additional fuel mass, ymmv). That doesn’t seem outrageous.