Your good with the VXCF4, so no change needed there. You can go with a FICM flash, but you won't see as good of results as some one who had a VXCF7 or VXCF9 would. They would be getting even worse MPG then you do. It should help alittle...but how much I could'nt say.
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19 F-350 6.7 Auto
16 F-350 6.7 Auto
05 Excursion 6.0, Auto, PHP Atlas 40 FICM, ARP Studs VXBC6(truck PCM)
00 F-350 7.3, 12 Speed, PHP Gryphon, PHP hydra, DAC3
95 F-Superduty 7.3 DI, Auto, Mechanics Truck
94 F-Superduty 7.3 DI, 5 speed, Flatbed
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