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Sorry to open an old thread. But, I have a 90 CRX HF. I have 185/60/14 tires on mine and I am getting mid to upper 40's. I am running Yokohama Avid TRZ tires. They are NOT LRR tires. I get my correct miles traveled by dividing the indicated by .9715. I had a bunch of issues initially. The PO had a SI ECU in the car. The EGR ports in the intake were very clogged and the EGR valve was sticking. It is running great now and my mileage has finally kind of become consistent. I think I would go to the 13" wheels and the proper size tires if I had to do it over again. I want to put rear wheel skirts on the car but the 14 inch wheels stick out a bit too much. I will have to curve the skirts out a little.
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