Proper Wire Size?

I am in the process of installing my Fitech FI on my Duster. I am using Fitech Dual Hyperfuel in-tank pumps and wanted some opinions on the wiring.

I have read about voltage drop / resistance increases when wires are run long distances.

Obviously, I am going be running a power wire from the EFI unit at the front of the car right back to the gas tank. The fuel pump wires coming out of the unit are 14GA and the wiring diagram on the fuel pumps also call for a 14GA to the + terminal. Based on the length of the car and the size of the wire, do you feel this is a cause for concern? Should I go a bit larger towards the pump?

Also, the batteries for the car are located in the trunk. I am going to run that wire right back there also. So same question, is this sufficent?

Thanks to anyone who can help,
Jim