Verizon is by far in front in raw mobile data tests in the US, a new benchmark concluded on Sunday. Its use of real, LTE-based 4G gave it average modem speeds of about 6.44Mbps in PCWorld tests, or more than twice as fast as the 2.83Mbps for a T-Mobile HSPA+ modem. The upload speed edge was wider still and reached a very fast 5Mbps while AT&T had just 1.05Mbps.