A bit of additional info. The chip in the ECU is from Superchips and was programmed by DPTuner and sent to me and I installed just the chip. Did not buy the tuner itself. The main reason for getting this in the first place was because the trans did not shift right after the rebuild with the OEM chip in (John Wood Transmission, different TQ converter, valving, etc.). So it improved the shifting way beyond event the stock van. There are other tuner/devices recommended to me also:
Prices vary greatly. Rather than buying the device, would it be possible to just send someone the chip and have it reprogrammed?
Main aim would be better MPG, but here are some improvements done in the past that may not make it possible:
Larger tires (285)
JBA Shorty headers
AFE Magnum Force air intake
Banks Catback Exhaust
Experts and users please give this novice some perspective on this and what you would do.