I'M guessing he did Dyno it, and it wasn't tuned properly and didn't put out near what it should and he just doesn't want to admit it.
-2001 Tahoe original 5.3 4x4 only 439k
-2001 Jincheng Panda(Honda Clone)
-1985 ATC70 with 125cc motor
-1973 CT70 with 125cc motor