Here's How Much More (Or Less) Fuel-Efficient My Automatic Car Is In Manual Mode 

I drive a 2003 Infiniti G35 Sedan. I love the car, it’s comfortable, handles well, and is fast by 4 door standards. I had it for over 2 years before deciding to use the manumatic transmission option, and after several months of almost exclusively using the user-controlled option, I’ve gotten a pretty good idea of fuel…