I drove to Atlanta from Baltimore traveling at 75 – 80 mph. My wife and I, a few travel bags, and a cooler accounted for all the weight. Nothing was on the roof. My wife has allergies; therefore I drive with the AC on all the time.
I travel into the city as little as possible. My worst mileage in Atlanta was 15.23 mpg.
My best mileage was 18.99 traveling back to Baltimore at 68 - 70 mph. The trick is to find a speed between 65 and 70 mph your car travels uphill without your transmission up-shifting.
I have a spreadsheet to track my mileage and gas usage. My average mpg from 6339 miles to 10667 miles is 16.70 mpg. I get over 400 miles per tank of gas. I used to floor the gas pedal when I first purchased the Armada and the gas mileage was dismal. Tahoes and Expeditions only saw my tail lamps.
I do very little city driving, but when I do I travel the streets with the least lights, or the quickest distance to the highway. Of the 70 miles I drive daily, only 5 are city miles.
The windshield imperfection is located near the top left area of the windshield and looks like soap film sandwiched between the glasses. Yes it is where the windshield curves.
A loose clip in the rear overhead console was the cause of the sqeak.
Check your oil level at each fill-up. A ½ qt low level has a negative effect on your mileage.
