Exmaverick

Hey guys. I have a 07 maxima. And Im my opinion my trip info is bugging. It says my average speed is 9-13mph???? That's not possible. Gives me like a average speed of 13mph even when Im on the highway. Also tells me my fuel economy is like 10.4 mpg. I drive fast, but Im no speed demon to waste that much gas. I tried resetting everything to zero (average speed, fuel economy and trip time) but i get the same or close to the same reading. Anybody had this same problem? Think Nissan has to reprogram it or could it be something else? Please help