Average Verizon Jetpack 4g speeds, what's to be expected?

[VZWiwtftetyp]

 We just added a couple lines and another jetpack. Our jetpack is only getting download speeds of 8mb download, 18mb upload with ONE device connected.  We went with VZW because we've been using it for many years, but if that's the fastest speed we can expect on a Jetpack, we're gong to have to switch providers. What's the average MiFi/Jetpack speed we should be seeing? We have the unlimited 4g plan, Jetpack by Pantech, 4g. The description of the plan says: Our 4G LTE network provides the high speeds and reliability Verizon is known for delivering.

Where are the high speeds?