Question about radar detector

[VamPyroX]

Depent how much RPM you push. I keep low my rpm so I made 75-80mph in everyday and I made around 310-340miles on full-time AWD. One time, I take long trip and I made 350miles at 80mph with A/C ON and close windows for 14 gallons of gas. Engine is over 120k mileages now. I don't see any different so much on A/C and off on highway for MPG.

Rules...Close windows and use A/C for highway, open Windows and don't use A/C for city for save gas if you wish.

A couple weeks ago, I got 30 mpg with a mini-van that I drove from Texas to New York. That was when I drove non-stop on a full tank of gas.

During that same trip, I pulled over a lot for food and rest... on another tank of gas. I ended up getting 25 mpg.