you need some tunes! and i think you would benefit more from tunes made for the 38r but i'll let someone else chime in. and ya 21 is normal with stock stuff.
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2002 7.3 F250 Supercab Shortbox
DIY intake
CCV dumped
Autometer gauges
WW/ATS 1.0 exhaust housing
Hutch/Harpoon in tank mods/hpX line
AIH delete/ebpv delete
TruCool trans cooler
Straight piped
PHP FU 
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