Originally Posted by country-boy
The denser winter air is causing you up to 2 mpg? Wow, that means out west guys should see at least 10+ mpg difference between the deserts and mountains. I hadn't heard it reported quite that high.....
I figured 1 mpg was winter fuel, the other mpg was air density. April is when I really noticed it. Cold at night caused mileage to go down, warm in the day brought it back up. My truck was also leveled 2 inches so the nose was higher in the wind than a stock truck.