i purchased a 2016 mustang gt performance pack and i'm not getting very good gas mileage. thinking i should get better then 13mpg intown, when i fill up it give me 165 til empty. any thoughts on this and if i need to take it to ford to be looked at.. you opinion is greatly appreciated.

 

It calculates estimated miles by how the car is driven. If you granny shift and take it easy that estimated milage will rise. If you alway are jumping on the throttle hard it will decrease.