I am only getting 12 MPG
Super Moderator
Joined: Mar 2011
Posts: 2,605
Likes: 197
From: Central NJ
Front and rear cameras, tire pressure for all four tires can display on screen,folding side view mir
Photo taken of tires on my previous G35
That tire was produced in the 33 week in 2007
If your tires are more than 4-5 years old get rid of them as they become dangerous.
Telcoman
Your exhaust leak will cause you to run lean, resulting in poor gas mileage...fact! All the other members have covered the basics, get that exhaust leak fixed and start using premium fuel! When possible driving on long runs use your cruise control, that alone is worth a few mpg's! 
Gary
Gary