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Not so much a chip, a reprogram of the PCM for mileage. 94-95 is when the "S" series trucks lost the ability to have removable chips in them. My early 95 S10 had a true obd2 PCM and I couldn't find anything but a jet chip, piggyback module for it. A custom mileage program for one would be the best bet. The main thing I would see as being a mileage deflector on this vehicle would be the 4wd and the tires it rides on. My 2WD S10 hit 29mpg every day. Can the front drive shaft be pulled on it? You really can't yank the transfer case and put a 4l60e or something in as it may not shift correctly until the pcm is swapped/programmed from a 2wd.
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