First off, no flaming. I did searches for "fuel economy" and "A/T" in all kinds of variations, but there's so many damn threads it's impossible to find what you want.
What I want to know is if anyone with a STOCK (non-lifted) truck noticed a substantial decrease in mileage when they went to A/T tires from, for instance, the Duelers that came on my Sport. The truck is not lifted, will not be lifted, and I'm not even going to do the ever popular 265/70 instead of 265/65. I'm not a hypermiler, but I drive 40k a year, and if I don't get 20 mpg out of my truck each tank, I'm not happy (best ever is 23). If the A/Ts will decrease mileage substantially. If they do, I'll stick to the H/T tires. Thanks guys.