For real-world driving in many cases, I don't believe it. Neither do the US EPA fuel-mileage ratings.
There are many variables - range between gears, axle ratios, types of driving, etc.
Two like vehicles - same weight, engines, wind resistance, etc. - doing the same speed with the engines at the same load and RPMs - will do basically the same regardless if auto or stick when the lock-up torque converter is locked. At lower speeds, in most cases the stick wins since there is less slippage and loss.
City or hill driving - it will depend a bit on what trans offers the best ranges to let the engine run at peak efficiency at various speeds.
I glanced at new EPA specs for many trucks and don't find any autos that beat stick if axles and engines are equal. Some autos are equal on highway but less for city driving.
Here are a few.
2008 F150 Ford 20 for stick, 19 for auto 2008 Ford Escape - 28 stick, 26 auto 2008 Ford Ranger PU - 26 stick, 24 auto 2008 Ford Ranger PU 4WD - 20 stick, 19 auto 2007 Chevy Silverado truck - 20 stick, 19 auto 2007 Chevy Silverado truck 4WD, 19 stick, 17 auto 2008 Jeep Liberty 3.7 4WD 22 stick, 21 auto 2008 Dodge truck - 3.7 both auto and stick get 19 highway, but stick beats auto for city driving.
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