I'm at about 2600 miles and drive my car mostly in combo driving. Perhaps 65% hwy/35% city driving. I pretty much always stay in the 18-19 mpg range. And thats checking via the fill up and divide the gallons into it method, though my computer estimate is usually with in 1/2mpg or so. I even got 18.5mpg on the tank that I got dyno tuned on. No complaints here.
Anyways, I'm totally tickled with the mpgs. My 1LE replaced my 2 wheel drive V6 Nissan Frontier, which coincidentally got almost the exact same gas mileage. That Frontier I had modded a fair amount to get it to the 325hp(crank) and 14.1 in the 1/4 range.
But now enters my 1LE. After I added a few mods like headers, hiflows, CAI, etc., I am still getting the same MPG as my truck, BUT gained 2 cylinders, about 175 horsepower, and about 1.5 seconds in the 1/4. Plus I have just a slight handling advantage in my 1LE

Oh, and the looks....Sweet!
AWESOME JOB CHEVY - I LOVE MY 1LE!!!!!!!!!!