I have a 2011 5.7L Hemi Crew Cab, 2WD, 3.55 gears and 20 inch wheels.
First the computer is off by 1 MPG (shows better than calculated).
I drive most of the week to work mixed highway/city so the avg. MPG is about 14.5 MPG (more city than Hwy).
Yesterday for the first time, I drove all in the city with plenty of lights and traffic. I noticed when sitting in traffic the MPG drops off big time. Just sitting still I burn the hell out of gas
. Computer showed 13.6 at the end of the day, so with the computer off I figured I really got 12.6 to 12.9 MPG.
Today drove on the interstate from 70 to 75 MPH and seamed to avg about 19 - 20 MPG
Is this the same situation for all the others with the same truck setup?