Mine also sits just below the half-way point.
Something important: OEM gauges are not intended to be accurate gauges, they are intended to give the owner a "normal" indication under acceptable operating conditions. This means they are pretty insensitive and don't show anything that might upset the average customer, unless it is REALLY serious. Supra owners have complained about this for years.
The truth is, the gauge is only there as a replacement for an idiot light, it really isn't the same as a good aftermarket gauge intended to tell you small differences in operation. Just food for thought.
And, to address the issue in this thread, I would take the car to the dealer, have them tell you it's normal, and insist they include this in the car's service record so if something does occur later on, you'll have a date showing you took the car in for service and they didn't do anything pro-active at that time. It can make getting a new engine a LOT easier if there is a real problem.