Welcome and enjoy the VOLT! The numbers do make sense! And the thing is the EPA or magazines do not have the numbers that reflect how one uses a car on a daily basis. You use electricity first the gas mileage is only for long trips.
The car is just fun to drive, so much more so than the conventional car.
Tboult is right about reading the owners manual, depending on the type and vintage of garage door open there are different ways to program it, sequence etc.
2011, My Zen-like Car, and Driving Experience #3187