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 430k
-A Metric Butt ton of three wheelers
-1985 V65 Magna
-1983 Nighthawk 650
-1969 F250 Highboy built 360