Nothing you've said suggests a problem, in and of itself. It is normal for the ICE to kick in from any stop. Depending on how far you're going in a parking lot and the SOC of the battery the ICE may kick in to recharge. Your mileage is a little lower than I'd expect based on the average high and low temps for Savannah, but not significantly so and there are many variables that you haven't elaborated on that come into play.
I guess the first few factors that you can control that may have an impact on both the MPG and frequency/duration of ICE operation are:
1)Oil level--go out and check it now. If it is even a tiny bit above the 'full' mark go to the dealer and have it drained to just below that level.
2)Tire pressure--the pressures listed in the owner's manual are much lower than what most folks feel will provide optimal fuel efficiency and tire wear and handling. I use 42f/40r, others us up to 44f/42r and notice a significant improvement.
3)Temperture control (A/C)--turn it down or off completely when ambient tempertures allow (which looks like almost always in your area). This is a very significant drain on MPG. I found an approximately 4mpg gain from one tank to the next with almost identical ambient tempertures by leaving the A/C completely off or using only on the lower settings (65 or 67 degrees) in the coldest temps (down to 18 degrees). I wore a warm coat and felt quite comfortable. Until today I hadn't seen a temperture greater than 48 degrees on this tank of gas with averages probably closer to 32-34 degrees and I'm currently showing 48.3mpg on the computer with about 3 bars left on the fuel guage. I drive at about 1000 feet elevation with lots of hills, mix of short (10 minute/5mile) commutes and longer commutes (15 miles/25 minutes).
Finally:
If you have a PDA you can check to make sure your car is operating within specs and learn a lot about the physical variable that affect your MPG and how much they affects your MPG by using Wayne Brown's THS II simulator:
http://www.seawell.net/Prius/PalmTHS2/THS2HiRes22.zip
I'm currently working on a long article about where the MPG ratings come from, what affects the mpg, and how you can improve your mpg. Maybe have it out next week.