I was never able to achieve more than 30-35Mbps wireless with the Verizon-supplied Actiontec 424WR Rev.I router.
Once I upgraded to the Asus RT-N66U, I had no difficulty hitting 80Mbps wireless on a 5.0GHz 802.11n network.
Here's the throughput I see on my iPhone 5 and iPad 4 (4th Gen) with the Asus router:
Neither Apple device achieved >35Mbps with the Actiontec router, and the iPhone 5 routinely achieved under 10Mbps with the Actiontec.
I have the 75Mbps FiOS plan.