Hello, I am new to the forum and I am in need of your opinions.
I have a 2008 e450 (Cube van) with a 6.0L turbo diesel engine.
It is a delivery truck and it is typically loaded while driving at 70 mph.
Its average fuel economy is 9.5 mpg.
Can I improve the fuel economy by adding a free flow exhaust system.
If I can , by how much?
Thanks for your help in advance..
Dan