[MetroMPG]

If you're talking true stop & go driving, very few cars are going to get close to their EPA / NRCAN ratings. The exception may be hybrids, making use of the engine stop feature & ability to drive at low speeds for short distances on electric power.

Curious: did you closely monitor the fuel economy of your previous car? Was it able to get near its official city fuel economy rating in the same conditions as the Spark? (I suspect not.)