I own a 72 dart swinger with a 225 slant 6 in it. and my fuel mileage is anywhere from 7 yes 7 to 13 mpg. The thing is driving me a little nuts since it is my daily driver. I bought and installed new spark plugs, spark plug wires, it has the stock electrical ignition, an accel coil. the gears are 2.79 if I remember right and is an 3 speed automatic. the car only has about 160,000 miles on it too and from what I hear and read that is about the half way point on these cars. I also had the timing redo by a mechanic and he set it to 5 twice the amount of what the stock is of 2.5 so I am not too sure if that helps any. I am still new to the car world and am learning a lot on the way to fixing my dart up.

When I bought it the previous owner already installed a two barrel carburetor, I am not too sure of which it is I will have to check and post later.

But I am seriously hoping I can do much better than 13 mpg so if you guys can give me any further detail it would be much appreciated.