2013 dodge ram 1500 8 speed, hemi is there a big difference in mileage when you change gears 3:55, 3:92 ?
If you are changing the gears with others that have a higher ratio than these, then there would be a slight difference in MPG. Usually, the higher the ratio, the better the mileage, but talk to a mechanic or a Dodge dealer for professional advice.
I have a 2013 Dodge Hemi also with Eco drive. Why would you want to change it? I get good gas mileage. 20-22 freeway