So I was trying to run my car down to less then 5 gallons since I have to replace the Fuel sending unit which is on its way here. I have a 67 Stang with the 16 gallon tank. I figured I would be getting at least 12-15mi/gal so around 192mi to the tank or more. But nope ran out of gas at 156mi from last fill to the top, so 9.75mi/gal. Should I be worried about gas mileage? I have a 289, 4v Edelbrock Performer intake, 600cfm Carter carb, Mild cam and a C-4 with 2.79 rear gears. I do mostly city driving not freeway. I read some past posts and people are getting 20mi/gal or more. I do feel my carb is running way too rich but wanted to get your folks thought.