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My 98 Ranger has been throwing codes P0171 and P0174 for a while now, but only during in town driving when running errands (not on the highway traveling long distances). Also of note, one of my cats is getting hot. I have melted carpet under my mat on the passenger side. I haven't used an IR...

OK, strap in, because this may be a long one.... This 4.0L OHV (166K miles) will throw a P0171 code during a regular, in town drive, but will never throw this code during highway driving. Also worth mentioning, the MPG is steadily going down the crapper. She used to throw both a P0171 and P0174...