Ouch! 155 miles? I feel bad when I am below 300 per tank.Installed 8 new coil pack, only two were toyota originals all the rest looked like cheap ones also torqued the spark plugs. I had terrible mileage like 1 gas tank would give me 145-155 miles only and had slight miss fires. It feels more responsive now and the engine sounds little different, I am not sure about the mileage will see if that improves.
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