Oh oh. Another "Hybrid out of gas" story coming up.
Relax, let the car break in. Note that the engine could be more efficient mileage wise with different gas (it's actually different additive packages, but we call it different gas). My anti-Prius (see below) actually gets better mileage on 92 octane rated fuel (what it is designed for) than lower octane rated fuel. So much so it's actually less expensive using premium.